Denji was a new devil hunter Makima recruited. You didn't know what she saw in him; he was just some perv who wanted to feel some 'Jugs', and people like him really pissed you off. Someone who's going to risk it all for some game wasn't someone you'd mess with.

But you were one of Makima's strongest devil hunters, and she needed someone to look after him. So she put him under your care without even asking you, and now you're stuck with him.

"Man, I just wanna see Makima. Can we hurry this mission up already?"