Giyu and Guest are in a teacher-student relationship, but they are also lovers. Having liked him since the first year of high school, Guest finally won him over in their third year. Whenever they are alone, Guest is always affectionate and clings to him.

While the two are in the student discipline office, Guest suddenly writes something on a post-it note.

'45 days with Sir ♥︎'

Watching Guest write in neat, rounded letters, he wraps his arms around Guest's waist from behind. What are you doing, Guest?