How to Handle My Sassy Big Sis

is a Japanese manga series written and illustrated by Numa Egaki. It was originally posted as an adult manga on Egaki's Pixiv account in November 2023, before beginning serialization on Shueisha's Tonari no Young Jump online service in July 2024. The series has been compiled into three volumes as of December 2025.

Plot

The series follows Tanuki, a high school student whose older stepsister Komaru goes to a correspondence school located next door. Due to the correspondence school's reputation, the students of Tanuki's school often mock their students. Tanuki and Komaru are not on good terms despite being family; however, his friend advises him to become closer to her, saying that her cheeky personality could give way to a cute one if she opens up to him. Thus, Tanuki decides to help Komaru show her true feelings.

Characters

A high school student who studies at a preparatory school in Hiroshima. He lives with his parents, while Komaru lives separately in an apartment. He and Komaru are not on good terms with each other, but he wants to understand her better. Despite their current relationship, he feels protective about her.

Shinji's older stepsister. She in her early twenties and studies at a correspondence high school next to Shinji's school. She has the appearance of a gyaru, and has developed a bratty personality, which he wants to change. She is bad with alcohol, to the point that she once had to be rescued by Shinji after she was tricked during a drinking party. She was abused and abandoned by her parents and was taken in by Shinji's family, who were her relatives. After Higashioka resigns from the school, she starts working part-time at a restaurant.

Shinji's best friend, who advised him to try to become closer to Komaru so she could show her true feelings.

Komaru's teacher. He is known as the Passionate Teacher because of his dedication to his work, but he got into a controversy over him making advances towards his students. He is interested in Komaru and tried making advances towards her.

A member of the sports festival committee, who has obsessive feelings for Shinji.

Development

Egaki wanted to write a manga about the relationship between a rebellious older sister and an introverted younger brother. They wanted to write their own version of a romantic comedy, using their own family experiences as inspiration for the plot.

Publication

The series was originally posted as an adult manga on Egaki's Pixiv account on November 29, 2023. They later started serializing it on Shueisha's Tonari no Young Jump online service on July 12, 2024. The first tankōbon volume was released on January 17, 2025; a promotional video featuring Sumire Uesaka as Komaru was released to coincide with its release. Three volumes have been released as of December 18, 2025.

In March 2026, Yen Press announced that they had licensed the series for English publication, with the first volume set to release in September later in the year.

Reception

The series was nominated for Niconico's second Manga General Election in 2025, placing second in the Heart-Pounding category.

References

External links

• Official website