The Anime Lad
Takezou is the last remaining member of his school koto club. Without recruits, the club will be terminated. Then Chika Kudou barges into the room and demands to join. His reputation frightens even other delinquents, which does not make Takezou feel better. The club has found a possible future in its least reassuring applicant.
Super Eyepatch Fox
A school koto club is one missing membership drive from ending. Takezou sits alone in the club room until Chika arrives and demands entry. Chika is known well beyond the school for frightening other delinquents. Saving the club now means deciding whether the only eager applicant is a threat or an unexpected chance.
Gigguku
Takezou is watching his koto club disappear one empty seat at a time, then Chika comes crashing in with a terrifying reputation and a demand to join. What an entrance. The setup puts a quiet traditional instrument beside a student everyone expects to cause trouble, then lets that impossible application hang in the room.
Father's Basement
The feared-delinquent introduction is familiar and the story makes sure nobody misses Chika's reputation. The useful complication is Takezou's position. He cannot simply reject the alarming stranger when the koto club needs members to survive. That makes the first meeting a practical problem before it becomes any larger judgment about character.