Zoku Toshishita no Anchikushou

A young man named Jin receives a letter from someone named Irodori, which sets off a series of events involving a substance called Anchikushou. The story includes a character named Taiyou who is also connected to Anchikushou. The narrative continues with the phrase Anchikushou FOREVER, suggesting ongoing significance. Another element is a character referred to as Cherry Girl, who is not to be called by that name.