I just realized...
Squids make ink
Pens have ink
You use ink to write
Monika started a literature club
Natsuki joined it, and likes fried squid apparently
SQUIDS MAKE INK
SO MONIKA SHOULD LIKE SQUIDS
CUZ THEY MAKE INK
AND PENS HAVE INK
AND YOU USE PENS, WHICH HAVE INK, TO WRITE
:O