株式会社理論社 News Releases

Noma Children's Literature Award Winner for 'How to Kill Sugimori-kun', now also confirmed for live-action film adaptation, drawing even more attention! Mariru Hasegawa's latest full-length fantasy 'The Door to 13 Witches' released!

Rironsha Co., Ltd. has released Mariru Hasegawa's latest full-length fantasy 'The Door to 13 Witches… · 2026-05-05

Noma Children's Literature Award Winner for 'How to Kill Sugimori-kun', now also confirmed for live-action film adaptation, drawing even more attention! Mariru Hasegawa's latest full-length fantasy 'The Door to 13 Witches' released!

Rironsha Co., Ltd. has released Mariru Hasegawa's latest full-length fantasy 'The Door to 13 Witches… · 2026-05-05

Nanako Matsuda's Latest Book! Even when apart, 'together' makes it more fun. Announcement of the release of a warm story that nurtures kindness & holding of an original art exhibition

Rironsha Co., Ltd. has released Nanako Matsuda's latest picture book, 'Issho ni Ensoku,' on April 20… · 2026-05-05

Nanako Matsuda's Latest Book! Even when apart, 'together' makes it more fun. Announcement of the release of a warm story that nurtures kindness & holding of an original art exhibition

Rironsha Co., Ltd. has released Nanako Matsuda's latest picture book, 'Issho ni Ensoku,' on April 20… · 2026-05-05

"Shokudo no Obachan," "Konkatsu Shokudo," "Yurei Izakaya" 3 Series Surpass 1 Million Copies Sold! Matsumoto Seicho Award-Winning Author Eiko Yamaguchi Releases First Children's Book!!

Matsumoto Seicho Award-winning author Eiko Yamaguchi is releasing her first children's book. This ma… · 2026-04-22

"Shokudo no Obachan," "Konkatsu Shokudo," "Yurei Izakaya" 3 Series Surpass 1 Million Copies Sold! Matsumoto Seicho Award-Winning Author Eiko Yamaguchi Releases First Children's Book!!

Matsumoto Seicho Award-winning author Eiko Yamaguchi is releasing her first children's book. This ma… · 2026-04-22