It's kind of ironic how Dazai and Chuuya abilities represent each other's past.
No Longer Human symbolises Chuuya's struggle for being human and his ability.
For the tainted sorrow symbolises Dazai's depressive past and Corruption shows how staying in the Mafia corrupted hus mind and thinking.
Okay so ummmmmm, after reading Storm Bringer I realized just how out of character Chuuya is, so I'm gonna unpublish it for a few days to edit it a bit, but don't worry no major changes will be made to the plot only how Chuuya acts