The Sister Who is Worried About Her Brother Who is Worried About His Sister Worries Her Friends, Part 1

Summary
Agata Sojiro fails his 1st entrance exams as he is worried about his sister Saaya. Saaya realizes that he failed because of her and takes the problem to the Sket room. They try to figure out who is 'Bosami' the name he keeps thinking about (Bossun>Saaya>Michiru). When Michiru enters the Sket room and explains Agata's mind frame. They then make a plan for Saaya to directly go and tell Agata what's in her mind but Agata thinks she is confused. The next day they make another plan to overwrite his mind work...