Isn't this the continuation of his shared dream with Ooi?
So it's possible he's just thinking "it's a dream, weird shit can happen, but it's not real" and isn't in the state of mind to put two and two together.
It's Ooi's dream. Of course her Kitakami-san is gonna stick around too.
so please make it next time.Ehhh...Something the matter?He's on a date with me today,See 'ya!Ah... no.*Squeeze!*Okay then! Please excuse Yukikaze, Commander!S-Sure...Tch!She's still here...*pat*You heard the girl! Get outta here!What's the meaning of all this...?