DONUTS Co., Ltd. (Shibuya, Tokyo; CEO: Keisei Nishimura), developer and operator of the vertical short-form drama app 'Tatedra,' has announced the production of the original drama series 'My Husband's Mistress Became My LINE Friend' (Original: Hatchi; Composition & Art: Universal Publishing / Published by KADOKAWA). The series is scheduled to premiere in early autumn 2026.

Official Website: https://tated.tv/linetomodachi/

'My Husband's Mistress Became My LINE Friend' is a live-action adaptation of the hit manga of the same name, which gained popularity after the author, Hatchi-sensei, shared her real-life story on Instagram. The manga was later published by KADOKAWA (Chiyoda, Tokyo; Director, Representative Executive Officer, CEO: Tsuyoshi Natsuno) and released across various digital platforms, becoming a massive success. The story follows Hatchi, the protagonist, who discovers her husband's betrayal and befriends his mistress on LINE, launching a clever and cathartic revenge plot. The realistic psychological battle and meticulous revenge plans against the 'trash husband' have resonated with readers, topping rankings on multiple platforms and surpassing 7.5 million views on LINE Manga.

Taking on the lead role in this live-action adaptation is Miho Watanabe! Formerly a member of Hinatazaka46, she has starred in notable works such as NHK's 'Tora ni Tsubasa' and the drama 'Jigoku wa Zenshin de Dekiteiru' (Kansai TV × FOD). She has also co-starred in the films 'Atashi no!' and 'Seishun Gesutaru Hōkai,' establishing herself as a rising star with both popularity and acting prowess. In this series, she plays Hatchi, the betrayed wife.

Playing Hatchi's husband, Tettsu, is Higashi Bukuro (Saraba Seishun no Hikari)! Known for his comedic talent, he will portray a despicable husband who conspires with his mistress to deceive Hatchi and steal money — a rare and highly anticipated villainous role.

Additionally, an audition to win a role in the series has been announced in collaboration with 'TOKYO IDOL FESTIVAL 2026 supported by Nishitan Clinic' and the live-streaming & video app 'Mixch.' For details, please visit the event page.

Event Details: https://mixch.tv/p/cahu6566

Main Cast Introduction

Lead: Miho Watanabe

Born February 24, 2000, in Saitama Prefecture.

Serves as ambassador for Saitama Supporters, Saitama Basketball, and the W League. Active in Hinatazaka46 from 2017 to 2022. After graduation, she starred in NHK's 'Tora ni Tsubasa' (2024), 'Jigoku wa Zenshin de Dekiteiru' (Kansai TV, 2025), and co-led films 'Atashi no!' (2024) and 'Seishun Gesutaru Hōkai' (2025). Recently, she played the heroine Totoko in the film 'Osomatsu-san: Human Trashification Plan!!!!!?' (released June 12, 2026), showcasing her versatility as an actress and talent.

Official Website: https://mihowatanabe.jp/

Official Instagram: https://www.instagram.com/mihowatanabe_

Higashi Bukuro (Saraba Seishun no Hikari)

Born October 6, 1985, in Osaka Prefecture.

Formed the comedy duo 'Saraba Seishun no Hikari' with partner Morita Tetsuya in 2008. Won the Excellence Newcomer Award at the 32nd ABC Comedy Newcomer Grand Prix in 2011. Reached the finals of 'King of Conte' in 2012 (runner-up), and again in 2013, 2014, 2015, 2017, and 2018. Founded his personal agency 'The Morihigashi' in October 2013. Active in solo live shows, variety programs, dramas, and music videos.

Saraba Seishun no Hikari Official Website: https://www.sarabaseisyunnohikari.com/

Work Overview

Title: My Husband's Mistress Became My LINE Friend

Release Date: Early autumn 2026 (planned)

Number of Episodes: Undecided

Distribution Platform: Vertical short-form drama app 'Tatedra'

◇ Cast

[Lead]

Miho Watanabe

[Co-Stars]

Higashi Bukuro (Saraba Seishun no Hikari), others to be announced

◇ Staff & Production

Producer: Kuninobu Igarashi (DONUTS Co., Ltd.)

Assistant Producer: Fan Zhang (DONUTS Co., Ltd.)

Production & Copyright: DONUTS Co., Ltd.

◇ Official Website & SNS Accounts

Official Website: https://tated.tv/linetomodachi/

Official X: https://x.com/tated_linetomo

Comment from the Original Creator: Hatchi-sensei!

[Comment]

It started as just a way to vent — a complaint post on Instagram. I never imagined it would become a drama. And now, Higashi Bukuro as Tettsu!? Somehow, it feels perfect — I can't believe it. And Miho Watanabe as Hatchi!? That’s the most unbelievable part of all.

This story is filled with miracles I still can’t believe. Please enjoy the cathartic satisfaction of karma.

[About the Original Manga]

A hit digital comic! 'I’ll get the decisive evidence!' What happens when the heroine befriends her husband’s mistress on LINE? Hatchi, a pastry chef, discovers her husband’s affair and approaches the mistress without revealing her identity. As she listens to the mistress’s love troubles, she uncovers a plan for a fake divorce. Instead of wallowing in sadness, Hatchi turns her anger into action and launches a detective-level investigation… This Instagram sensation, known for its dramatic twists, has now been adapted into a manga!

Original: Hatchi

Composition & Art: Universal Publishing

Distribution: KADOKAWA

URL: https://www.kadokawa.co.jp/product/322107000018/

About 'Tatedra'

'Tatedra' is a vertical short-form drama app centered on original content. Long-form stories are divided into ~2-minute episodes, making it ideal for smartphone users to enjoy during spare moments.

◆ Tatedra Overview

Title: Tatedra

Genre: Vertical short-form drama app

Distribution: Smartphone app (iOS, Android)

Copyright: © DONUTS Co. Ltd. All Rights Reserved.

Price: Free (with in-app purchases)

App Icon

◇ Tatedra App Download

Available on App Store and Google Play via the link below. (Recommended for ages 12 and up)

https://app.adjust.com/1kh8d9uo

◇ Tatedra Official Website & SNS Accounts

Tatedra's official SNS channels share detailed updates on releases, cast comment videos, behind-the-scenes content, and more.

FACT BOX

  • Source: PR TIMES
  • Category: New Product
  • Organizations: KADOKAWA