is a Japanese manga series written and illustrated by Jun Wakatsuki. It was originally serialized in Kodansha's Shōnen Magazine Edge from November 2022 to October 2023, before transferring to their Magazine Pocket service in February 2024. The series has been compiled into six volumes as of July 2026. An anime television series adaptation has been announced.
Plot Koichi Okuta is a huge fan of the nationally popular idol group Melty Strawberry, particularly its member Mizuki Natsuno. However, Mizuki is the group's least popular member, with rumors recently emerging that she will soon be leaving the group. One day, Koichi wakes up to discover Mizuki is now his stepsister, his father having remarried. With Mizuki discouraged about her idol career and Koichi being her only fan, Koichi vows to help her become the center of Melty Strawberry and boost her popularity, while Mizuki promises to marry him if he can fulfill his promise.
Characters
A high school student and a fan of Melty Strawberry. He got into idols after his mother's death, quickly falling in love with the idol Mizuki Natsuno. After his father remarries, he becomes Mizuki's stepbrother, with the two now living together. He previously proposed to her during a meet-and-greet session with her, with Mizuki promising to accept his feelings if he helped her become the group's center.
Nicknamed , she is a member of the idol group Melty Strawberry. Despite having been a member of the group for years, she is by far its least popular member, with most fans being turned off by her cold personality. Due to her lack of popularity, she has been considering ending her idol career, but changes her mind with Koichi's help.
A member of Melty Strawberry. Because of her being the most popular member, she often serves as the center for the group, gaining the nickname "Eternal Center".
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
A member of Melty Strawberry.
Media Manga The series is written and illustrated by written and illustrated by Jun Wakatsuki, who originally began serializing it in Kodansha's Shōnen Magazine Edge on November 17, 2022. Following the magazine's discontinuation in October 2023, the series transferred to Kodansha's online service Magazine Pocket on February 3, 2024. The first volume was released on July 7, 2023; five volumes have been released as of July 9, 2026. The series is also released in English on Kodansha's K Manga web service.
Anime An anime television series adaptation was announced on July 8, 2026. The opening theme song is , performed by Yuika.
References
External links Manga official website at Magazine Pocket Anime official website