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Spoiler
Ah also Nishio won't come out of the storage room until chapter 10 where he goes to his mother to reassure her but it's just temporary. He'll be officially released in chapter 13 if I remember correctly
Also they're students basically children, what can they do really?
Yes they do what you think is right at this age
I think many of you don't realize that Nishio can't actually leave the storage room because of:
1. he's in heat so complicated to move. I mean, you just have to read omegaverse to realize that it's complicated for an omega in heat.
2. he can't go home because if he does, his mother will worry when she sees his condition and that's what he absolutely wants to avoid.
3. he can't go to Takai's either because Takai's father is going to realize something, I mean he's a doctor
4. Also it hasn't been a week but 2/3 days max (well that's already a lot in fact )
I think I went around so no hate please, it's just to explain because a lot of people talk about it.