A Summer's Accomplice

A Summer's Accomplice

ひと夏の共犯者
Ended First aired 04/Oct/2025 Japan Japanese 2 season(s) 13 episode(s)
Mystery
A devoted university student's idol obsession takes a dark turn when he shelters his wounded celebrity crush after her scandalous romance makes headlines, only to uncover her hidden split personality and suspected involvement in a musician's murder—forcing him to choose between love and truth in a dangerous descent into twisted loyalty.
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TimeScore 33% Skip It
Binge Meter 48% Slow Burn
Episode Pulse Quiet 40% activity score
Drop Rate 0% Very Low

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Seasons & Episodes

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Season 1 · Season 1
12 episode(s) · Air date: 04/Oct/2025
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Season Overview

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S1E12
Episode 12
Air date: 20/Dec/2025 · Runtime: 23 min
Summary

Takumi and Maki visit the seaside town where Mio was born and raised. The two enjoy a brief moment together, but the police are closing in... What will be the outcome for the two at the end of their escape...?! The final episode is finally here!

Summary

Takumi and Maki visit the seaside town where Mio was born and raised. The two enjoy a brief moment together, but the police are closing in... What will be the outcome for the two at the end of their escape...?! The final episode is finally here!

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S1E11
Episode 11
Air date: 13/Dec/2025 · Runtime: 23 min
Summary

The police finally storm in! Takumi (Hashimoto Masaki) and Maki try to escape on a motorbike, but...!? Meanwhile, Aina explains the whole story at the police station...

Summary

The police finally storm in! Takumi (Hashimoto Masaki) and Maki try to escape on a motorbike, but...!? Meanwhile, Aina explains the whole story at the police station...

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S1E10
Episode 10
Air date: 06/Dec/2025 · Runtime: 23 min
Summary

Mio (Tsunematsu Yuri) watches a video and regains an important memory about the death of her ex-boyfriend Kaito (Asano Junya). Meanwhile, Takumi (Hashimoto Masaki) gets into an argument with Aina over Mio/Maki. Takumi's feelings for Maki grow stronger.

Summary

Mio (Tsunematsu Yuri) watches a video and regains an important memory about the death of her ex-boyfriend Kaito (Asano Junya). Meanwhile, Takumi (Hashimoto Masaki) gets into an argument with Aina over Mio/Maki. Takumi's feelings for Maki grow stronger.

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S1E9
Episode 9
Air date: 29/Nov/2025 · Runtime: 23 min
Summary

When Mio (Tsunematsu Yuri) wakes up, she sees a man lying next to her covered in blood and panics. Meanwhile, Aina (Nagase Riko) finds out that Mio has another personality, and tells her other personality, Maki, "Give me back Mio, you fake!"

Summary

When Mio (Tsunematsu Yuri) wakes up, she sees a man lying next to her covered in blood and panics. Meanwhile, Aina (Nagase Riko) finds out that Mio has another personality, and tells her other personality, Maki, "Give me back Mio, you fake!"

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S1E8
Episode 8
Air date: 22/Nov/2025 · Runtime: 23 min
Summary

Takumi (Hashimoto Masaki) gradually begins to feel attracted to Maki, who lives with the sadness of Mio (Tsunematsu Yuri). Meanwhile, Miyake (Masaki Reiya), a detective pursuing Mio, happens to cross paths with Maki deep in the mountains.

Summary

Takumi (Hashimoto Masaki) gradually begins to feel attracted to Maki, who lives with the sadness of Mio (Tsunematsu Yuri). Meanwhile, Miyake (Masaki Reiya), a detective pursuing Mio, happens to cross paths with Maki deep in the mountains.

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S1E7
Episode 7
Air date: 15/Nov/2025 · Runtime: 23 min
Summary

Takumi (Hashimoto Masaki) has come to Tokyo to retrieve evidence. Mio's (Tsunematsu Yuri) disappearance has caused a big stir in Tokyo, and after meeting his mother at her home, Takumi's heart wavers and he makes a decision. Then, Sajima receives a new visitor...!?

Summary

Takumi (Hashimoto Masaki) has come to Tokyo to retrieve evidence. Mio's (Tsunematsu Yuri) disappearance has caused a big stir in Tokyo, and after meeting his mother at her home, Takumi's heart wavers and he makes a decision. Then, Sajima receives a new visitor...!?

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S1E6
Episode 6
Air date: 08/Nov/2025 · Runtime: 23 min
Summary

Another personality, Maki, begins to tell Mio (Tsunematsu Yuri) about her tragic past. Takumi (Hashimoto Masaki) decides to go to Tokyo alone to carry out the tasks Maki left undone.

Summary

Another personality, Maki, begins to tell Mio (Tsunematsu Yuri) about her tragic past. Takumi (Hashimoto Masaki) decides to go to Tokyo alone to carry out the tasks Maki left undone.

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S1E5
Episode 5
Air date: 01/Nov/2025 · Runtime: 23 min
Summary

Takumi (Hashimoto Masaki) is visited by his classmate Mizukawa (Jotaro), Mio (Tsunematsu Yuri), and Mona (Ishikawa Ruka), who enjoy a brief summer together by playing in the river and watching fireworks. However, the police are steadily closing in on them...!?

Summary

Takumi (Hashimoto Masaki) is visited by his classmate Mizukawa (Jotaro), Mio (Tsunematsu Yuri), and Mona (Ishikawa Ruka), who enjoy a brief summer together by playing in the river and watching fireworks. However, the police are steadily closing in on them...!?

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S1E4
Episode 4
Air date: 25/Oct/2025 · Runtime: 23 min
Summary

When Maki (Tsunematsu Yuri) asks him a question, Takumi (Hashimoto Masaki) decides to kill his childhood friend Mona (Ishikawa Ruka). He recalls memories from his childhood and is heartbroken, but...!?

Summary

When Maki (Tsunematsu Yuri) asks him a question, Takumi (Hashimoto Masaki) decides to kill his childhood friend Mona (Ishikawa Ruka). He recalls memories from his childhood and is heartbroken, but...!?

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S1E3
Episode 3
Air date: 18/Oct/2025 · Runtime: 23 min
Summary

Takumi (Hashimoto Masaki) and Mio (Tsunematsu Yuri) are shocked by the arrival of Mona (Ishikawa Ruka), Takumi's childhood friend. They enjoy a fun time at the festival, but at the same time, Mio's disappearance causes a stir in the world...!?

Summary

Takumi (Hashimoto Masaki) and Mio (Tsunematsu Yuri) are shocked by the arrival of Mona (Ishikawa Ruka), Takumi's childhood friend. They enjoy a fun time at the festival, but at the same time, Mio's disappearance causes a stir in the world...!?

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S1E2
Episode 2
Air date: 11/Oct/2025 · Runtime: 23 min
Summary

"My beloved idol might be the murderer..." What's more, she has another personality inside her... A suspenseful love story about a man who becomes an accomplice and falls into depravity!

Summary

"My beloved idol might be the murderer..." What's more, she has another personality inside her... A suspenseful love story about a man who becomes an accomplice and falls into depravity!

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S1E1
Episode 1
Air date: 04/Oct/2025 · Runtime: 23 min
Summary

Living together with your favorite idol is like a dream... But she might be a murderer!? A suspenseful love story begins, featuring a man falling into a phantom love and a dangerous, heartbreaking escape!

Summary

Living together with your favorite idol is like a dream... But she might be a murderer!? A suspenseful love story begins, featuring a man falling into a phantom love and a dangerous, heartbreaking escape!

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Season 0 · Specials
1 episode(s) · Air date: 27/Dec/2025
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Season Overview

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Cast

Main cast members.

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Masaki Hashimoto
Takumi Iwai
Yuri Tsunematsu
Yuri Tsunematsu
Mio Katagiri / MIO / Maki
Riko Nagase
Riko Nagase
Aina Amase
Ruka Ishikawa
Ruka Ishikawa
Mona Chikusa
Jyotaro
Jyotaro
Shota Mizukawa
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Amane Uehara
Ema

Crew

Creators, directors, writers, and production crew.

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Tsuguhiro Motomura
Co-Producer
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Erika Fujita
Producer
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Rina Sobue
Producer
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小池利幸
Sound Recordist
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Yûsuke Moriguchi
Screenplay

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