>>283613926
Denji is a very simple person. If someone likes him, he likes them back. He has no friends, he has no family, Asa is the only person who gives a fuck about him even existing.
There was never any grand reason for him to like anybody. He is starved for love. And Asa has shown it by caring about his well-being and opening up to him about her past experiences, which Denji himself has done in turn. He never opened up about his past even to the likes of Aki and Power, who were like family to him, yet he did so to Asa, which shows a high level of trust she has in her.