The Reason My Boyfriend Married My Older Sister
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.
Written by Erika Toyama
Produced by: Fumitsugu Ijuin, Wataru Murashima, Ai Yamazaki
Where to watch in 
United States
Switch country in the top-right to check availability elsewhere.
Not streaming yet in United States
Be the first to know when The Reason My Boyfriend Married My Older Sister lands on a major platform
Drop your email and we'll send you ONE message the moment The Reason My Boyfriend Married My Older Sister is streaming on a major platform in United States. No spam. Cancel anytime.
While you wait
Similar titles streaming now in United States
Want to check the major streaming services manually?
Or switch country at the top to check availability elsewhere. The Reason My Boyfriend Married My Older Sister may be streaming in another market.
Who's in it
Tap any actor to see their other movies and shows.
More like The Reason My Boyfriend Married My Older Sister
Audience picks based on what people who watched this also enjoyed.
Burn the House Down
2023
Fishbowl Wives
2022
Hero
2001
Tokyo Revengers
2021
Return to Eden
1983
BLUE EYE SAMURAI
2023
Hell Girl
2005
Fullmetal Alchemist: Brotherhood
2009
The Fragrant Flower Blooms with Dignity
2025
Redo of Healer
2021
The Fruit of Grisaia
2014
Cursed in Love
2020
More from Shiori Akita
Their other work, ranked by what audiences actually watched.
Kakegurui: The Movie
2019
Mr. Hiiragi's Homeroom
2019
The Flowers of Evil
2019
L♡DK: Two Loves Under One Roof
2019
Chastity High
2024
Romantics Anonymous
2025
When It Rains, It Pours
2025
Kakegurui Twin
2021
17.3 about a sex
2020
Rental a Girlfriend
2022
The Incident
2023
Blue Summer
2018
More from Riho Takada
Their other work, ranked by what audiences actually watched.
Kamen Rider
1971
Ghost Theater
2015
Kamen Rider × Super Sentai: Super Hero Wars
2012
Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals
2011
Kamen Rider x Kamen Rider Fourze & OOO Movie Wars Mega Max
2011
OOO, Den-O, All Riders: Let's Go Kamen Riders
2011
Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie Wars Core
2010
Kamen Rider OOO 10th: The Core Medals of Resurrection
2022
The Blue Bird
2008
Kidan Piece of Darkness
2016
Seven Detectives
2015
CSI: Crime Scene Talks
2011
Series from Japan, streaming in United States
Kamen Rider
1971
Mushoku Tensei: Jobless Reincarnation
2021
Bleach
2004
Re:ZERO -Starting Life in Another World-
2016
JUJUTSU KAISEN
2020
HELL MODE: The Hardcore Gamer Dominates in Another World with Garbage Balancing
2026
MF GHOST
2023
In the Clear Moonlit Dusk
2026
The Apothecary Diaries
2023
Pokémon
1997
March Comes In Like a Lion
2016
Dragon Ball Z
1989