What's up with you two?

Gotou-san got a scary letter.

WHAT DID YOU SAY?!

W-Wait, Nijika!

Why are you glaring at me?! Onee-chan hasn't done anything yet!

Here's the letter she got...

Kita~n

Dear Bocchi-chan,
I'm keeping my eye on you Hehehehehe.
- Seika

Gaaaaaaah!