Starring Rino Wachi! BUMP Original Drama 'On the Edge Sister' Premieres Exclusively on June 17 at 7 PM

emole Inc. (Headquarters: Meguro-ku, Tokyo; CEO: Naomichi Sawamura; hereinafter 'emole'), the company operating the short drama app 'BUMP', will exclusively premiere its original short drama series 'On the Edge Sister' on the 'BUMP' app starting June 17, 2024 (Wednesday) at 7:00 PM.

This series is a love story depicting the precarious relationship between step-sisters living under one roof. Within each episode of approximately three minutes, the drama captures the blurred lines between 'poison,' 'temptation,' and 'pure love' lurking in everyday life, delivered through the fast-paced rhythm and striking visuals unique to short-form drama. Viewers will experience, through the protagonist Yuji's perspective, thrilling and intense moral dilemmas in every episode.

■ Rising stars Rino Wachi and Kokoro Inuzuka co-star in a forbidden love triangle that challenges reason

The story is brought to life by a talented cast known for their fresh sensibility and strong acting skills.

[Rino Wachi] as Aika Miyazaki
Rino Wachi, acclaimed for her delicate performance in the film 'Aku no Hana' and numerous dramas and commercials, brings her ethereal charm to the role of Aika, Yuji's step-sister. In this series, she portrays a character who embodies both 'adult allure' and 'vulnerability,' fully immersing herself in the role of a dangerously captivating heroine.

[Kokoro Inuzuka] as Yuji Miyazaki
Kokoro Inuzuka, a member of EBiDAN (Ebisu Academy Boys), steadily building his acting career, plays Yuji, a university student. Caught between two step-sisters, he portrays a relatable young man torn between 'desire' and 'affection' with nuanced and passionate performance.

[Asayo Ohguma] as Misaki Shindou
Asayo Ohguma, an active model and actress with strong social media presence, plays Misaki, Aika's biological younger sister and Yuji's classmate. She brings her natural charisma and expressive talent to this pivotal role, using her 'mischievous charm' to unsettle Yuji in contrast to her sister.

Anticipate the breathtaking psychological tension and unpredictable dynamics woven by these three talented performers.

■ Synopsis

Yuji, a university student, unexpectedly begins living with his step-sister Aika. While confused by her vulnerability, he is drawn to her mature allure. Then, Aika's biological younger sister and Yuji's classmate, Misaki, suddenly moves in as well. Torn between the seductive charms of his step-sister and step-sister-in-law, Yuji struggles in the forbidden space between 'desire' and 'love.' Where will his heart ultimately lead?

■ Program Overview

Title: 'On the Edge Sister'

Release Date and Time: June 17, 2024 (Monday) at 7:00 PM (20 episodes total)

Distribution Platform: Short drama app 'BUMP'
▶ Program Details: https://emolebump.go.link/dWtqW

Cast: Rino Wachi (Aika Miyazaki), Kokoro Inuzuka (Yuji Miyazaki), Asayo Ohguma (Misaki Shindou), and others

Production Staff:
Director: Akihiro Toda
Screenplay: Keita Hoshimei
Executive Producer: Naomichi Sawamura
Production: Minto Inc.
Production and Copyright: emole

■ About the Short Drama App 'BUMP'

'BUMP' is a short-form drama app operated by emole, with over 3 million total downloads※. Each episode runs 1 to 3 minutes, offering users a fresh entertainment experience. Users can enjoy episodes for free via a 'wait-to-watch' model (similar to manga apps), pay ¥97 (tax included) per episode, watch ads, or subscribe to an all-you-can-watch plan. The platform offers diverse genres including romantic comedy, revenge-themed stories, mystery, youth romance, and action. Promotional clips from the official BUMP accounts have surpassed 5 billion views※, delivering exciting short-form content primarily to Gen Z women.
※As of January 2026

BUMP Official Website: https://www.bump.studio/

▶ App Download: https://emolebump.go.link/djCyg
▶ YouTube: https://www.youtube.com/@bump_drama
▶ TikTok: https://www.tiktok.com/@bump_drama
▶ Instagram: https://www.instagram.com/bump_drama/
▶ X (formerly Twitter): https://x.com/bump_drama

■ About emole Inc.

Company Name: emole Inc.
Address: 3F, Meguro Yamate-dori Building, 2-23-18 Shimo-Meguro, Meguro-ku, Tokyo
Founded: November 15, 2018
Representative: Naomichi Sawamura, President and CEO
Company Website: https://emole.co.jp/home