Dealing with abuse and depression since she was young, Mariko Ikagawa sought solace in Tomoyo Shiino—the start of a friendship that continued until adulthood. Now a 26-year-old office worker, Shiino is baffled when she hears a newscaster report that Mariko has killed herself. Though Shiino doubts the news at first, she accepts the truth after being unable to contact Mariko and begins to wonder the reason behind her suicide.

Looking to free her from her despicable father, Shiino impulsively steals Mariko's remains from him. Reunited with her dear friend, Shiino travels to a certain location Mariko wanted to visit, all while remembering their happy memories together.

Included one-shot: Yiska

My Broken Mariko was awarded the Bros. Comic Award by TV Bros. magazine in 2020. The manga ranked fourth in the 2021 Kono Manga ga Sugoi! for the Female Readers division.

The series was published in English by Yen Press on November 10, 2020. It was also released in Italian by J-POP on January 13, 2021; in French by Éditions Ki-oon on January 28, 2021; and in Brazilian Portuguese by Editora JBC on March 5, 2022.

The manga was adapted into a live-action movie that was released on September 30, 2022.