Master and New Talent Compete in Police Novels — New Releases from Tokuma Bunko in April, Featuring Latest Works by Popular Series Authors Bin Konno and Kyoichi Narugami, Plus a New Title from Noted Author Ikuko Sasame of 'Fukagawa Ayakashi Yashiki Kitan'!
Tokuma Shoten announces its April 2026 new releases, showcasing a blend of established masters and rising stars in the police novel genre. The lineup includes the seventh installment of Bin Konno's popular 'Tramper Yokohama Minatomirai Police Department Anti-Violence Section' series, the fourth book in Kyoichi Narugami's 'Shonan Mobile Forensic Team: Koyuki Asahina' series, and a new historical novel from Ikuko Sasame, 'Kakureyado Hatagoya Tsubaki Musubi-cho'. The announcement provides details, synopses, and special previews for each title, along with information on previous works and e-book availability.
📋 Article Processing Timeline
- 📰 Published: April 8, 2026 at 20:00
- 🔍 Collected: April 8, 2026 at 11:31
- 🤖 AI Analyzed: April 18, 2026 at 15:05 (243h 33m after Collected)
Tokuma Shoten Co., Ltd. (Head office: Kami-Osaki, Shinagawa-ku, Tokyo; Representative Director and President: Hideyuki Komiya) announces the release of this month's new Tokuma Bunko publications on Tuesday, April 14, 2026.
■Bin Konno 'Tramper Yokohama Minatomirai Police Department Anti-Violence Section'
Cover photo = Akihiko Yokoi
Title: Tramper
Yokohama Minatomirai Police Department Anti-Violence Section
Author: Bin Konno
Price: 913 yen (tax included)
Format: Bunko (paperback)
Pages: 432P
Release: Tuesday, April 14, 2026
ISBN: 978-4-19-895119-1
Product Page:
[Tokuma Shoten] https://www.tokuma.jp/book/b675552.html
[Amazon] https://www.amazon.co.jp/dp/4198951195/
Stop the 'pretext scam' that lines the pockets of the yakuza! Hamada's bouncer and Team Morohashi race through the warehouse district of Port Yokohama! The seventh installment in the hugely popular police novel series.
An inquiry came in from Section Chief Nagata of the Prefectural Police Headquarters. It seems that the Ichida-gumi, a yakuza group in the jurisdiction, is involved in a 'pretext scam' where goods are ordered on credit but the payment is not made after receipt. A joint raid with the Prefectural Police Headquarters on a warehouse owned by Ichida ended up empty-handed. Someone within the police leaked information — Morohashi continues the investigation with suspicion. Then, a report came in that the body of a detective was found floating in Honmoku Wharf!
●Special public preview of the first section of this book (up to P23)
The first 23 pages of this book are available for preview on this page. Please feel free to read them as a sample.
●Introduction to the previous work in the series
Cover design = Haruhiko Kono + FISCO
Title: Taigi (Great Justice) Yokohama Minatomirai Police Department Anti-Violence Section
Author: Bin Konno
Price: 869 yen (tax included)
Format: Tokuma Bunko
Pages: 272 pages
Release: January 2024
ISBN: 978-4-19-894914-3
Product Page:
[Tokuma Shoten]
https://www.tokuma.jp/book/b639275.html
[Amazon]
https://www.amazon.co.jp/dp/419894914X
No conflicts will be allowed in Yokohama.
Team Morohashi's efforts to combat violence in the port city.
■Kyoichi Narugami 'Shonan Mobile Forensic Team: Koyuki Asahina - The Shadow of the Hot Spring Steam'
Cover photo = iStock
Title: Shonan Mobile Forensic Team: Koyuki Asahina
The Shadow of the Hot Spring Steam
Author: Kyoichi Narugami
Price: 891 yen (tax included)
Format: Bunko (paperback)
Pages: 304P
Release: Tuesday, April 14, 2026
ISBN: 978-4-19-895122-1
Product Page:
[Tokuma Shoten] https://www.tokuma.jp/book/b675554.html
[Amazon] https://www.amazon.co.jp/dp/4198951225/
The towel tells the tale of murderous intent —
An almost completely enclosed hot spring inn.
Koyuki's 'small discovery' changes the whole case!
The fourth installment of the popular police series.
At a long-established hot spring inn in Sengokuhara, Hakone, a female guest is found stabbed to death. Koyuki Asahina of the Mobile Forensic Team, who arrived at the scene, felt a slight discomfort. The scent that should naturally emanate from the victim's belongings was absent. An almost completely enclosed hot spring inn, conflicting testimonies, and a missing murder weapon. Koyuki's small doubt gradually uncovers an unexpected truth hidden within the inn. She won't miss any evidence! The fourth installment of the popular police series featuring the strongest forensic unit. (Newly written)
●Special public preview of the beginning of this book, up to Chapter 1, Section 3 (up to P35)
The first 35 pages of this book are available for preview on this page. Please feel free to read them as a sample.
●Introduction to the previous work in the series
Cover photo = iStock
Title: Shonan Mobile Forensic Team: Koyuki Asahina
The Curse of the Black Cavern
Author: Kyoichi Narugami
Price: 880 yen (tax included)
Format: Bunko (paperback)
Pages: 288P
Release: October 2025
ISBN: 978-4-19-895057-6
Product Page:
[Tokuma Shoten] https://www.tokuma.jp/book/b669189.html
[Amazon] https://www.amazon.co.jp/dp/4198950571/
Solving the mystery of the ghost tunnel with science!
The curse of the spirits that bewilder the strongest forensic unit 'MFU'---
The highly anticipated 3rd installment of the popular police novel series!
●The e-book versions of the first and second books in the series are now available on Kindle Unlimited (all-you-can-read)!
(Scheduled until the end of May)
'Shonan Mobile Forensic Team: Koyuki Asahina'
https://amzn.asia/d/0cdyLdux
'Shonan Mobile Forensic Team: Koyuki Asahina - Fragments of Intent to Kill'
https://amzn.asia/d/09GBiK0m
■Ikuko Sasame 'Kakureyado Hatagoya Tsubaki Musubi-cho'
Cover illustration = _an
Title: Kakureyado
Hatagoya Tsubaki Musubi-cho
Author: Ikuko Sasame
Price: 902 yen (tax included)
Format: Bunko (paperback)
Pages: 320P
Release: Tuesday, April 14, 2026
ISBN: 978-4-19-895120-7
Product Page:
[Tokuma Shoten] https://www.tokuma.jp/book/b675555.html
[Amazon] https://www.amazon.co.jp/dp/4198951209/
Rather than kill your heart,
It's far better to cry out for what you desire —
An Edo romance weaving together the destinies of people who met at an inn in Shitaya,
lighting a beacon of hope beyond sorrow.
A new star appears in the historical novel world!
Akihiko, a young flute player who was abandoned by his mother and grew up fearing his father's violence, takes over the 'Tsubakiya' inn in Shitaya Sakamotocho, which was run by his unknown uncle, after his uncle's death. However, there was a mysterious girl named Tsubaki in the inn, which should have been empty. Akihiko chases Tsubaki away, but his uncle's diary records days spent with Tsubaki, who looked exactly the same as she does now, seventeen years ago. The encounter between the non-human girl and the lonely young man changes the fate of the people who gather at the inn.
●Special public preview of the beginning of this book (up to P39)
The first 39 pages of this book are available for preview on this page. Please feel free to read them as a sample.
■Contact for press inquiries regarding this matter
[Tokuma Shoten PR Contact]
C-Publishing Service Co., Ltd. Public Relations and Advertising Department
pr★c-pub.co.jp (Please convert ★ to @ before sending)
■Bin Konno 'Tramper Yokohama Minatomirai Police Department Anti-Violence Section'
Cover photo = Akihiko Yokoi
Title: Tramper
Yokohama Minatomirai Police Department Anti-Violence Section
Author: Bin Konno
Price: 913 yen (tax included)
Format: Bunko (paperback)
Pages: 432P
Release: Tuesday, April 14, 2026
ISBN: 978-4-19-895119-1
Product Page:
[Tokuma Shoten] https://www.tokuma.jp/book/b675552.html
[Amazon] https://www.amazon.co.jp/dp/4198951195/
Stop the 'pretext scam' that lines the pockets of the yakuza! Hamada's bouncer and Team Morohashi race through the warehouse district of Port Yokohama! The seventh installment in the hugely popular police novel series.
An inquiry came in from Section Chief Nagata of the Prefectural Police Headquarters. It seems that the Ichida-gumi, a yakuza group in the jurisdiction, is involved in a 'pretext scam' where goods are ordered on credit but the payment is not made after receipt. A joint raid with the Prefectural Police Headquarters on a warehouse owned by Ichida ended up empty-handed. Someone within the police leaked information — Morohashi continues the investigation with suspicion. Then, a report came in that the body of a detective was found floating in Honmoku Wharf!
●Special public preview of the first section of this book (up to P23)
The first 23 pages of this book are available for preview on this page. Please feel free to read them as a sample.
●Introduction to the previous work in the series
Cover design = Haruhiko Kono + FISCO
Title: Taigi (Great Justice) Yokohama Minatomirai Police Department Anti-Violence Section
Author: Bin Konno
Price: 869 yen (tax included)
Format: Tokuma Bunko
Pages: 272 pages
Release: January 2024
ISBN: 978-4-19-894914-3
Product Page:
[Tokuma Shoten]
https://www.tokuma.jp/book/b639275.html
[Amazon]
https://www.amazon.co.jp/dp/419894914X
No conflicts will be allowed in Yokohama.
Team Morohashi's efforts to combat violence in the port city.
■Kyoichi Narugami 'Shonan Mobile Forensic Team: Koyuki Asahina - The Shadow of the Hot Spring Steam'
Cover photo = iStock
Title: Shonan Mobile Forensic Team: Koyuki Asahina
The Shadow of the Hot Spring Steam
Author: Kyoichi Narugami
Price: 891 yen (tax included)
Format: Bunko (paperback)
Pages: 304P
Release: Tuesday, April 14, 2026
ISBN: 978-4-19-895122-1
Product Page:
[Tokuma Shoten] https://www.tokuma.jp/book/b675554.html
[Amazon] https://www.amazon.co.jp/dp/4198951225/
The towel tells the tale of murderous intent —
An almost completely enclosed hot spring inn.
Koyuki's 'small discovery' changes the whole case!
The fourth installment of the popular police series.
At a long-established hot spring inn in Sengokuhara, Hakone, a female guest is found stabbed to death. Koyuki Asahina of the Mobile Forensic Team, who arrived at the scene, felt a slight discomfort. The scent that should naturally emanate from the victim's belongings was absent. An almost completely enclosed hot spring inn, conflicting testimonies, and a missing murder weapon. Koyuki's small doubt gradually uncovers an unexpected truth hidden within the inn. She won't miss any evidence! The fourth installment of the popular police series featuring the strongest forensic unit. (Newly written)
●Special public preview of the beginning of this book, up to Chapter 1, Section 3 (up to P35)
The first 35 pages of this book are available for preview on this page. Please feel free to read them as a sample.
●Introduction to the previous work in the series
Cover photo = iStock
Title: Shonan Mobile Forensic Team: Koyuki Asahina
The Curse of the Black Cavern
Author: Kyoichi Narugami
Price: 880 yen (tax included)
Format: Bunko (paperback)
Pages: 288P
Release: October 2025
ISBN: 978-4-19-895057-6
Product Page:
[Tokuma Shoten] https://www.tokuma.jp/book/b669189.html
[Amazon] https://www.amazon.co.jp/dp/4198950571/
Solving the mystery of the ghost tunnel with science!
The curse of the spirits that bewilder the strongest forensic unit 'MFU'---
The highly anticipated 3rd installment of the popular police novel series!
●The e-book versions of the first and second books in the series are now available on Kindle Unlimited (all-you-can-read)!
(Scheduled until the end of May)
'Shonan Mobile Forensic Team: Koyuki Asahina'
https://amzn.asia/d/0cdyLdux
'Shonan Mobile Forensic Team: Koyuki Asahina - Fragments of Intent to Kill'
https://amzn.asia/d/09GBiK0m
■Ikuko Sasame 'Kakureyado Hatagoya Tsubaki Musubi-cho'
Cover illustration = _an
Title: Kakureyado
Hatagoya Tsubaki Musubi-cho
Author: Ikuko Sasame
Price: 902 yen (tax included)
Format: Bunko (paperback)
Pages: 320P
Release: Tuesday, April 14, 2026
ISBN: 978-4-19-895120-7
Product Page:
[Tokuma Shoten] https://www.tokuma.jp/book/b675555.html
[Amazon] https://www.amazon.co.jp/dp/4198951209/
Rather than kill your heart,
It's far better to cry out for what you desire —
An Edo romance weaving together the destinies of people who met at an inn in Shitaya,
lighting a beacon of hope beyond sorrow.
A new star appears in the historical novel world!
Akihiko, a young flute player who was abandoned by his mother and grew up fearing his father's violence, takes over the 'Tsubakiya' inn in Shitaya Sakamotocho, which was run by his unknown uncle, after his uncle's death. However, there was a mysterious girl named Tsubaki in the inn, which should have been empty. Akihiko chases Tsubaki away, but his uncle's diary records days spent with Tsubaki, who looked exactly the same as she does now, seventeen years ago. The encounter between the non-human girl and the lonely young man changes the fate of the people who gather at the inn.
●Special public preview of the beginning of this book (up to P39)
The first 39 pages of this book are available for preview on this page. Please feel free to read them as a sample.
■Contact for press inquiries regarding this matter
[Tokuma Shoten PR Contact]
C-Publishing Service Co., Ltd. Public Relations and Advertising Department
pr★c-pub.co.jp (Please convert ★ to @ before sending)