u/Bipolar_microbe

A few days ago I realized that there is a special chapter called "Ryu-side" which was part of a special manga book made by various manga creators. The special chapter was included in one of the two volumes of the book. Sora volume. Apparently, the story is about Ryu's perspective on the events that happen in the main manga. It made me really curious and I would love to be able to read it, but I haven't found anything. Has anyone here had the opportunity to read it? Or does anyone know where to find it? Are there other special chapters included in books that have nothing to do with Kimi ni Todoke?