Filmon working part-time on Truffle to buy you a birthday present.

Happen around a year after the story end maybe?

Story:

Herissmon discovered that Michi and others spend a lot to pay for your and Herissmon’s anniversary party, so Herissmon want to pay it back and ask Chihiro to allow them to do part time on Truffle.

(They insisted even though Michi and others already said it’s alright.)