Wait, did the chapter switch between Eastern and Western name order? Nanase is more plausible as a given name, but the Yuri wiki lists Irie as the protagonist's given name. (It's also more plausible as one than Yuunagi)
EDIT: This matters because we have a a headmate who gets annoyed when we refer to Japanese characters or people by Western name order, so knowing which it is will save us some trouble.