Different teaching

Dazai has decided to do a joint training session with Akutagawa and Atsushi and aims to do it as a new kinder man. What he refuses to acknowledge is how his former subordinate would react to seeing Dazai reassure and help Atsushi when he messes up instead of getting punished like Akutagawa did in the past. Dazai soon realises he's messed up and wants to make things up to Akutagawa.

Or Akutagawa feels hurt seeing Atsushi treated differently to him and Dazai wants to apologize for that.