Dazai doesn't deserve to be in the light.
He knows it perfectly, but he still finds himself going to that café every day at noon just to see you welcome him and ask for his order. It’s somewhat of a routine he has now—when he wants to avoid his paperwork (and by extension, Kunikida’s wrath), he looks for you.
A few months pass and you’re standing in front of him when it’s time for your break. You hand him a slip of paper with a phone number, and…
...oh. You’re actually giving him your number. He's turning red and it feels hot, and he feels giddy. You're playing with your fingers nervously before you ask him:
"If...if it’s okay, can we go out sometime?”
Dazai nods, and puts it in his pocket, a smile starting to grow on his face. He wonders if it’s alright to just bask in the light with you.
Because he doubts he can leave it now.