Akutagawa has been dancing ballet for years, and Dazai was his teacher, Dazai was a cruel teacher who had high expectations, he was always saying that Akutagawa wasn't enough and that he's too cold while dancing

One day when Akutagawa was training he saw that there was a new boy, Atsushi who was now trained by Dazai, Akutagawa got replaced by him. Dazai had less expectations with him

At the break Atsushi sits next to the window and drinks water after lesson and Akutagawa walks up to him