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Betrothed to My Sister's Ex S1E1 — I Could Never Replace My Sister

8.1

Betrothed to My Sister's Ex•Season 1•Episode 1

I Could Never Replace My Sister

8.1/10 · 47 votesJul 5, 202525 min

Ranked #5 of 12 in Season 1•+0.2 vs season avg

Marie is always dressed in tatters and is treated like a servant in her own home. Then she meets Count Kyros.

Directed byTakayuki Kitagawa

Written byKenta Ihara

Next episodeE2 · Marie, I Want to Marry You

Seasons1

Season 1 Episodes12

I Could Never Replace My Sister still

E1 8.1Now viewing

I Could Never Replace My Sister

Marie, I Want to Marry You still

Marie, I Want to Marry You

A Life I Saw in a Dream, and a Dream-like Life still

A Life I Saw in a Dream, and a Dream-like Life

I've Found the Things I Like still

I've Found the Things I Like

The Prince and the Pitch-Black Warrior still

The Prince and the Pitch-Black Warrior

Am I Enough As I Am? still

Am I Enough As I Am?

You're So Close, I Think You May Make Me Dizzy still

You're So Close, I Think You May Make Me Dizzy

A Gift More Lovely Than Jewels still

A Gift More Lovely Than Jewels

In Pursuit of Anastasia's Spirit still

In Pursuit of Anastasia's Spirit

Please Call Off the Betrothal still

Please Call Off the Betrothal

The Empty Princess Lives still

The Empty Princess Lives

It's Time to Settle This still

It's Time to Settle This

Cast9

Rena Motomura

Rena Motomura

Marie (voice)

Daiki Hamano

Daiki Hamano

Kyros (voice)

Minami Tanaka

Minami Tanaka

Anastasia (voice)

Ryohei Kimura

Ryohei Kimura

Louisphon (voice)

Yoko Hikasa

Yoko Hikasa

Mio (voice)

Sayaka Ohara

Sayaka Ohara

Ryu Ryu (voice)

Tetsuya Kakihara

Tetsuya Kakihara

Toppo (voice)

Tatsuyuki Kobayashi

Tatsuyuki Kobayashi

Thomas (voice)

Yuuka Aisaka

Yuuka Aisaka

Tunica (voice)

Crew12

K

Kenta Ihara

Writer

T

Takayuki Kitagawa

Storyboard Artist

T

Takayuki Kitagawa

Director

A

Akiko Sato

Supervising Animation Director

N

Nagisa Nakajima

Animation Director

W

Wakako Yoshida

Animation Director

A

Akira Ito

Key Animation

M

Miyuki Inoue

Key Animation

A

Akane Imada

Key Animation

A

Akira Iwasaki

Key Animation

H

Hiroya Kamakura

Key Animation

Y

Yosuke Kikuchi

Key Animation

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Episode Summary

"I Could Never Replace My Sister" is episode 1 of Betrothed to My Sister's Ex season 1. It scored 8.1/10 from 47 votes, ranking #5 of 12 episodes this season (season average 7.9). Directed by Takayuki Kitagawa and written by Kenta Ihara, it aired on July 5, 2025.

Next: E2 · Marie, I Want to Marry You Best of Season 1