I think it is Isuzu. The twintail is rather short but I think that's to do with the chibi-fied art style.
Edit: It's weird, really. It's too thick to be Sendai. The twintail should be more of an equal length (even from this perspective) to be Isuzu. And the right side ponytail(?) should be more to the middle if it's Shioi.
We still continue to struggle. However...Even after we have obtained human bodies, everything is still the same.Dwelling inside of each of us now is a human heart.A heart which believes in precious things.