[Childhood friends x co-dependency] Kuroki, a perfect handsome boy who excels at both sports and studies, goes straight home after school every day to look after his childhood friend Mashiro, who is a shut-in. However, on the day of their middle school graduation ceremony, Mashiro tells Kuroki that he is also graduating from school. The love between the two, which they cannot express, begins to eat away at each other in a twisted way...?

One-shot published in Harta volume 50.

*Notes: \- Original serialization ran for six chapters. In the volume release, Chapters 5 and 6 were combined as Chapter 5. \- Includes one extra chapter.*

USCA is a doujin manga anthology headed by Keita Mori.