A spin-off series set 6 years before the events of Zenaku no Kuzu focused on Yumeji Sonoda's college days.

Kazuya is a teenager who is worried about himself acting differently in his daily life then what his heart actually believes. One day he encounters Mio, a serious suicidal girl who slits her own wrist. He is then attracted to her uncontrollably and the two became lovers soon after Kazuya's confession. After spending some time with each other, Mio's personalty is changed bit by bit, right before she was murdered...

There are places in Japan you should never go to. Mei and Hibiki are sisters who grew up near Mount Fuji's "Sea of ​​Trees." While helping their childhood friend, Teru, move, they discover a strange box, which triggers a series of mysterious phenomena around the sisters...!? (Source: Kadokawa, translated)

The murderer Konno Chika stands out in the story of "Gedou no Uta." A spin-off revolving around "urban legends" begins with her as the main character! The door to a mysterious world opens when she meets the occult researcher Kuze! A spin-off of "Gedou no Uta"! (Source: Shonen Gahosha, translated)

From [Amazon Japan](https://www.amazon.co.jp/%E3%83%89%E3%82%AF%E3%82%BF%E3%83%BC%E3%83%A1%E3%82%B7%E3%82%A2-%E3%83%93%E3%83%83%E3%82%B0%E3%82%B3%E3%83%9F%E3%83%83%E3%82%AF%E3%82%B9-%E5%AF%BA%E6%B2%A2-%E5%A4%A7%E4%BB%8B/dp/4091857183): If you have worries about sports, this guy will solve them! This person set up an office called Meshiai in a multi-tenant building in the Shinjuku Kabukicho area. At first glance, he's a middle-aged guy who is plump and dull, but, in fact, he is the super sports doctor referred to as "Doctor Messiah," said to "solve the troubles of athlete with just words!" Reporter Aya Kawamura from a sports paper is interested in the Meshiai, so she decides to cover the athletes & activities there. In the end, is the Meshiai really an unusual swindler or a good doctor...? (This text was poorly and partially translated until I got stumped (is 飯合/Meshiai the name of his office & does it mean Meeting About Food, while sounding like Messiah Doctor?) from the description from [Amazon Japan](https://www.amazon.co.jp/%E3%83%89%E3%82%AF%E3%82%BF%E3%83%BC%E3%83%A1%E3%82%B7%E3%82%A2-%E3%83%93%E3%83%83%E3%82%B0%E3%82%B3%E3%83%9F%E3%83%83%E3%82%AF%E3%82%B9-%E5%AF%BA%E6%B2%A2-%E5%A4%A7%E4%BB%8B/dp/4091857183). Corrections followed by the removal of this note would be appreciated.)