Masaki Hashimoto
Takumi Iwai
Series
Watch A Summer's Accomplice (2025) Online
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Synopsis
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.
Episodes
Season 1
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1. Episode 1Now viewing2025-10-0423m5.0Living 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!
2. Episode 22025-10-1123m5.0"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!
3. Episode 32025-10-1823m4.0Takumi (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...!?
4. Episode 42025-10-2523m4.0When 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...!?
5. Episode 52025-11-0123m4.0Takumi (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...!?
6. Episode 62025-11-0823m5.0Another 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.
7. Episode 72025-11-1523m5.0Takumi (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...!?
8. Episode 82025-11-2223m4.0Takumi (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.
9. Episode 92025-11-2923m4.0When 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!"
10. Episode 102025-12-0623m5.0Mio (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.
11. Episode 112025-12-1323m5.0The 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...
12. Episode 122025-12-2023m5.0Takumi 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!
Cast
Top Billed Cast
No photo 
Yuri Tsunematsu
Mio Katagiri / MIO / Maki
Riko Nagase
Aina Amase
Ruka Ishikawa
Mona Chikusa
Jyotaro
Shota Mizukawa
No photo Amane Uehara
Ema
Availability
Where To Watch Legally
No legal streaming, rental or purchase options for A Summer's Accomplice were reported for this region.
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FAQ
Frequently Asked Questions
Is A Summer's Accomplice available to watch online?
Vidbox does not currently have a legal streaming, rental or purchase option on record for A Summer's Accomplice in this region.
How many seasons does A Summer's Accomplice have?
A Summer's Accomplice has 1 season and 12 episodes.
When did A Summer's Accomplice first air?
A Summer's Accomplice first aired in 2025.
Is A Summer's Accomplice still running?
A Summer's Accomplice's status on TMDB is: Ended.
What genre is A Summer's Accomplice?
A Summer's Accomplice is classified as Mystery.