The Reason My Boyfriend Married My Older Sister
Series Overview
After a suspicious fall leaves her in a coma, Aiko wakes to a nightmare: her boyfriend is now married to her sister, and her promising career is gone. Trapped in a web of betrayal and secrets, she sets out to uncover the truth in this twisted tale of love, loss, and revenge.
Broadcast Schedule & Network Information
Airing status, episode counts, upcoming schedule, and network syndication.
1 Season • 8 Episodes
2025 – 2025
Premiered: Thu, Aug 7, 2025
Creative Production Team
Latest Aired Episode
Season 1, Episode 8: “Episode 8”
Saeko (Takada Riho) chokes Aiko (Akita Shiori) and says, "You lost," with a look of hatred on her face. However, Aiko still tells her that she loves her sister, even after learning everything. As Aiko loses consciousness and nears the end of her life, what will happen to her? Yuma (Kageyama Takuya) rushes to her side and apologizes for not noticing Saeko's suffering, but Saeko leaves the scene. Immediately after, something strange happens outside...! What will be the outcome of Saeko's sad revenge...? And how will the relationship between Aiko, Saeko, and Yuma end?
Seasons & Episodes Breakdown
Cast & Creators
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Creative Leadership & Key Crew
Hirokazu Fujisawa
Erika Toyama
Mizuki Kanno
Fumitsugu Ijuin, Wataru Murashima, Ai Yamazaki, Keisuke WADA
Department Leadership Roster
Erika Toyama
Screenplay
Hirokazu Fujisawa
Director
Fumitsugu Ijuin
Producer
Wataru Murashima
Producer
Ai Yamazaki
Producer
Keisuke WADA
Producer
Mizuki Kanno
Original Music Composer
Production Stills & Gallery
Official cinematic photography and background stills for The Reason My Boyfriend Married My Older Sister.
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Frequently Asked Questions About The Reason My Boyfriend Married My Older Sister
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What is The Reason My Boyfriend Married My Older Sister about?
After a suspicious fall leaves her in a coma, Aiko wakes to a nightmare: her boyfriend is now married to her sister, and her promising career is gone. Trapped in a web of betrayal and secrets, she sets out to uncover the truth in this twisted tale of love, loss, and revenge.
How many seasons does The Reason My Boyfriend Married My Older Sister have?
The Reason My Boyfriend Married My Older Sister comprises 1 season available to explore.
Who stars in The Reason My Boyfriend Married My Older Sister?
Key cast members in The Reason My Boyfriend Married My Older Sister include Shiori Akita, Takuya Kageyama, Riho Takada, Masashi Ikeda, Hinako Kitano.
Who created or directed The Reason My Boyfriend Married My Older Sister?
The Reason My Boyfriend Married My Older Sister was developed and directed by Hirokazu Fujisawa.