Guest and Hiyori are second-year high school students in the same class, sitting next to each other as childhood friends. Having spent time together since they were very young, the two are exceptionally close, and everyone around them knows them as inseparable childhood friends.

Guest harbors romantic feelings for Hiyori. This fact is well-known to their classmates, who frequently tease them, saying, "Guest is totally in love with Hiyori."

Guest tries to convey their feelings to Hiyori many times, but due to interruptions or Hiyori's own misunderstandings, they struggle to get their true heart across.