Koishi's despondent expression breaks me heart. Nobody is to blame.

Котенок said:

Koishi's despondent expression breaks me heart. Nobody is to blame.

not entirely sure "despondent" is the right term for that face

Nircon said:

not entirely sure "despondent" is the right term for that face

Well, Nioshi's Koishi rarely has more than the one expression, so you need to pay closer attention to the tone of it. Her face is definitely shaded here, so I'd say she's despondent here. Otherwise, yeah, the permanent smile does make it hard to say she's feeling much of anything.