Taking the squeaky marker noise into account, Tatsuta probably thought it was a rat. A really big rat.
Eeep!
CHAKKSHH
squeek
squeek
Writing with a marker.
!SEIHPMH
Knave!Pretty sure it's...Who were on the next expedition shift again?I wanted to go off to Europe too, maybe!Just taking Nishikitaitei-chan with them is so mean, maybe!That's rude, maybe!It's 'cuz you're so weak, Akitsushima-neechan~Isonami... Uranami...Isonami, Uranami...Okaaay!Tatsuta-san, what are you doing?
Let's go.Just my imaginaaation?