[Upon hearing that voice, his attention is immediately grabbed. That's from behind him, so it ends up with Dazai curiously bending himself back.]

Atsushi! What a pleasant surprise! I just got here, actually. For the very merry month of May! By the fact that this surprises you, I'm assuming you're far more used to this place.

Which is great news for me, because I was getting depressingly lonely on my own. And you know I should never be left fully unsupervised. [He says, nonchalantly, before simply returning back to his normal sitting position and taking another bite of his dango.

Who knows what he could do if left alone~? Terrifying.]