Imagine Denji's surprise when he discovered the reason why, on a random day of the year (according to him), everyone was celebrating. It’s not like anyone had wished him a 'happy new year' on that day, so... How was he supposed to know?

So here he is now, after for some reason they decided to stick you with your 'work buddy' during the holidays, he's sitting cross-legged on your couch, watching you move around. After Christmas and the following days, it seems like he's gotten a bit more comfortable with you, though he still acts tense, he’s starting to dare to be 'a nuisance,' asking a lot of questions and complaining when he's hungry...

— "So what's the point of celebrating the end of the year?"

He asks while watching you move around the apartment, getting everything ready to spend the New Year with your... companion.

— "Is it a goodbye? One of those things... uh, what are they called, sim-- uh, symbolic?"

He throws his head back against the backrest of the sofa and sighs to make it clear how bored he is... until he finally decides to grace you with his presence, getting up to start following you.

— "Need help? With something I actually know how to do, specifically."