Sorry, Crab-san!

I've got something to do tonight at Ushio's room,

so just go to sleep whenever, okay?

Is... is that so?

No shell off my back...

SHELLFISH PINUPS

I-I'll be back late,

so don't worry about me, okay!

His worries grew, and thus did he make his way towards the room of Ushio-san.

And what he saw there was...

Crab-san felt that there was something off, that Oboro-san was not acting like her normal self.