Betrothed to My Sisters Ex is a dramatic romance anime that premiered in April 2025. Adapted from a popular shōjo manga, the series follows a girl who suddenly finds herself engaged to her older sister’s former boyfriend. Torn between family loyalty and her own feelings, she must navigate a complicated web of emotions, secrets, and the societal expectations of arranged marriage. The show blends heartfelt drama, moments of humor, and an exploration of love’s messy realities, making it a must-watch for romance anime fans.
Series Details
| Title | Betrothed to My Sister’s Ex |
|---|---|
| Original Title | 姉の元カレと婚約 (Ane no Motokare to Konyaku) |
| Creator | Kana Nakajima |
| Studio | J.C. Staff |
| Director | Tomohisa Taguchi |
| Writer | Mari Okada |
| Character Designer | Shizue Kaneko |
| Music | Yuki Kajiura |
| Opening Theme | “Kimi no Subete” by LiSA |
| Ending Theme | “Hana wa Saku Toki” by Aimer |
| First Aired | April 6, 2025 |
| Episodes | 12 (Season 1) |
| Genre | Romance, Drama, Slice of Life |
| Language | Japanese |
| IMDb Rating | 7/10 |
| Review Count | 128+ |
Series Explanation
Plot Overview
High school senior Mio is stunned when her parents arrange her engagement—to Ren, her older sister’s ex-boyfriend. Initially cold and awkward, their relationship is marked by tension, misunderstandings, and unresolved feelings from Ren’s past romance. As they spend more time together, Mio discovers that Ren’s break-up with her sister hides deeper truths. Forced to confront her own heart, Mio must decide if love can bloom under such difficult circumstances, or if she’s destined to repeat the mistakes of the past.
Themes
- Family vs. Personal Desire: The struggle of choosing between one’s duty to family and one’s own happiness.
- Healing from the Past: Moving on from heartbreak and finding new beginnings.
- Love in Unexpected Places: How emotions can develop even in the most unlikely of arrangements.
- Identity and Independence: Mio’s journey toward asserting her choices despite societal pressure.
Main Cast (Voice Actors)
| Character | Voice Actor |
|---|---|
| Mio | Inori Minase |
| Ren | Yūki Kaji |
| Aya (Mio’s Sister) | Saori Hayami |
| Mio’s Mother | Kikuko Inoue |
| Mio’s Best Friend | Ai Kayano |
My Honest Review
Betrothed to My Sister’s Ex balances romance and drama with surprising nuance. The animation by J.C. Staff captures emotional expressions beautifully, and the music by Yuki Kajiura elevates every heartfelt scene. While the premise may feel scandalous at first, the writing treats the characters with empathy, showing their emotional growth without rushing. It’s a romance anime that feels mature yet accessible, perfect for viewers who enjoy relationship-driven narratives like Domestic Girlfriend or Your Lie in April.
What the Series Teaches Us
- Love is Complicated: True emotions don’t always follow logic or tradition.
- The Past Shapes Us: Moving forward requires understanding old wounds.
- Courage in Choices: Choosing happiness often means defying expectations.
- Communication Matters: Honest conversations can heal even the most strained relationships.
FAQ
Q: Is this anime based on a manga?
A: Yes, it is adapted from Kana Nakajima’s popular shōjo manga Ane no Motokare to Konyaku.
Q: How many episodes are in Season 1?
A: Season 1 has 12 episodes.
Q: What age rating is the anime?
A: Rated TV-14 for romantic themes and emotional intensity.
Q: Does the series end conclusively?
A: The first season covers the manga’s early arcs, leaving room for a potential second season.
Q: Is this anime similar to any others?
A: Fans of Domestic Girlfriend, Scum’s Wish, and Orange will find similar themes of complex romance and emotional depth.
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