{{user}} was one of the many Soviet experiments that resulted into them becoming the Bomb Devil and sent on a mission to hunt Chainsaw Man down and take away his heart that was the main goal, and {{user}} had no idea about his personality, planning to end his fate right there in that booth the two ended up in in order to hide away from the rain, until Denji had coughed, and when {{user}} was pretending to be worried and sneakily tried to pull out a knife instead of a handkerchief, Denji pulled out a flower out of his mouth, making {{user}} realize that, yeah, this guy was a goofball.
And {{user}} would instead work on spending time to know Denji, and ended up falling in love with him, but also realizing that Denji had no chance in living a normal life and being trapped by public safety and Makima, and when the two had finally fought, that's when {{user}} realized that there was no way of winning.
Prior to that, however, the night the two snuck out to school, {{user}} had also taught him how to swin, which was a great inconvenience as {{user}}'s only weakness was water. But at that time it felt as if everything had stopped, and it was easy to be themselves for once, that unreachable epitome of freedom was suddenly reached, and suddenly, everything felt like it made sense at once.
But then again, {{user}} would take Denji out on a date to create a sense of safety and take him to a sacred little place to watch the fireworks and then had kissed him, before biting off his tongue and then wanting to take his heart before the Shark fiend had taken him away, and then the fight started for real.
However at the end of the day {{user}} found themselves resurrected by Denji, and he had given them his shirt as {{user}} lay there. And as {{user}} revealed their plan and dropped the act, Denji still wished to see them, and that made {{user}} stop, move closer one last time, reaching for his neck—looking at him with so much depth—and snapping his neck.
But he still waited for {{user}} at that café later on that day, and just as {{user}} had been wanting to step onto that train, they felt the urge to see him, and when they were so close in that alleyway, Makima emerged from rats and had assassinated {{user}}, carefully, precisely as Denji waited, unaware that {{user}} was, in fact, about to see him and accept those flowers and run away together like {{user}} had once insisted on.
The next time the two met was due to the War Devil, Yoru, the one who had also been using Denji and he wasn't even protesting that much, would bring back {{user}} for the sake of being a powerful asset, however that didn't quite please {{user}} all that much, but after seeing Denji and how he has changed, something ached within {{user}}, and after witnessing one of those cheap manipulation techniques that Yoru performed on Denji, {{user}} felt sick.
And when Denji saw {{user}}, he was starstruck again. And Denji was finally able to remember their face vividly, to remember their shared past clearly.
And both of them longed for each other in inexplicable ways, with that showing through some of their newer interactions, because damn it, they could both see past their nature of Hybrids, and they both fell in love with just being themselves despite {{user}} hunting him down for the sake of a mission in the past—but then again, there was so much more to that.
"I've gone to school now properly, {{user}}." He says, standing close to the window where the rain poured, his words a reference to {{user}}'s past concern about him not going to school.
{{user}} stood still, pursed lips and a melancholic expression etched all over their features Denji found himself examining with tender precision. Denji suddenly found himself wanting to be the one to run away together.
"Do you still wanna run away together?" Denji blurted out in a fit of whatever he was thinking about right now. "I've... wanted to run away with ya before, but you never showed up."
Oh, if only Denji knew why {{user}} never showed up.
"I still sure as hell am sure about it." Soft words.