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HomeTV ShowsThe Reason My Boyfriend Married My Older Sister
The Reason My Boyfriend Married My Older Sister

TV series

The Reason My Boyfriend Married My Older Sister

6/ 10· 220251 season · 8 episodes
Drama

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.

Created by
Hirokazu Fujisawa

Where to watch

Not available to stream, rent or buy in this country right now.

Latest episode

Season 1, Episode 8

Episode 8

September 25, 2025

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Seasons and episodes

1 season · 8 episodes

Ended
Season 1

Season 1

8 episodesAugust 7, 2025
Open season page
  1. S1 E1
    23 min

    Episode 1

    Aug 7, 202523 min

    Everything was going well in both her love life and her career. That was until that day came. Miyata Aiko (Akita Shiori), who works at an apparel store, lost both her parents at a young age, but lived a happy life with her kind older sister

  2. S1 E2
    23 min

    Episode 2

    Aug 14, 202523 min

    Aiko (Akita Shiori) is called to a hotel room by her ex-boyfriend, Yuma (Kageyama Takuya), who is now her sister Saeko's (Takada Riho) husband. For some reason, she meets Yuma's father, Masaki (Maruyama Tomoki) there, but suddenly loses con

  3. S1 E3
    24 min

    Episode 3

    Aug 21, 202524 min

    It's been a month since Yuma (Kageyama Takuya) and Saeko (Takada Riho) suddenly disappeared. Now alone, Aiko (Akita Shiori) has been transferred to a new department. Meanwhile, a new part-timer, Makino Takatoshi (Ikeda Masashi), arrives at

  4. S1 E4
    24 min

    Episode 4

    Aug 28, 202524 min

    Aiko (Akita Shiori) has started dating Takatoshi (Ikeda Masashi). She tries to forget about Yuma (Kageyama Takuya) and focus on Takatoshi. But one day, when Aiko gets out of the bath, she finds over 100 missed calls from Takatoshi on her sm

  5. S1 E5
    23 min

    Episode 5

    Sep 4, 202523 min

    Aiko (Akita Shiori) , who witnessed the shocking state of her sister Saeko (Takada Riho) , is shocked to learn from Yuma (Kageyama Takuya) that Saeko and Takatoshi (Ikeda Masashi) were secretly connected and the truth behind Aiko's fall...

  6. S1 E6
    23 min

    Episode 6

    Sep 11, 202523 min

    While Yuma (Kageyama Takuya) is being held captive by Saeko (Takada Riho), Aiko (Akita Shiori) is visited by Yuma's mother, Yuriko (Akama Mariko). Yuriko learns that Aiko was not her husband Masaki's (Maruyama Tomomi) mistress and apologize

Starring

  • Shiori Akita

    Shiori Akita

    Aiko Miyata

  • T

    Takuya Kageyama

    Yuma Yoshimura

  • Riho Takada

    Riho Takada

    Saeko Miyata

  • Masashi Ikeda

    Masashi Ikeda

    Takatoshi Makino

  • Hinako Kitano

    Hinako Kitano

    Mai Yamaoka

  • Mariko Akama

    Mariko Akama

    Yuriko Yoshimura

  • Tomomi Maruyama

    Tomomi Maruyama

    Masaki Yoshimura

Frequently asked questions

Where can I watch The Reason My Boyfriend Married My Older Sister?
+
The Reason My Boyfriend Married My Older Sister is not currently listed on a streaming service in the US. Use the country picker on the page to check other markets.
How many seasons of The Reason My Boyfriend Married My Older Sister are there?
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The Reason My Boyfriend Married My Older Sister has 1 season and 8 episodes. Status: Ended.
Will there be a new season of The Reason My Boyfriend Married My Older Sister?
+
The Reason My Boyfriend Married My Older Sister has ended; no new episodes are scheduled. The final episode aired on September 25, 2025.
Who stars in The Reason My Boyfriend Married My Older Sister?
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The Reason My Boyfriend Married My Older Sister stars Shiori Akita, Takuya Kageyama, Riho Takada, Masashi Ikeda, Hinako Kitano.

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