Jibun Daisuki Umezono-kun to, Sono Shinja-chan.

"If you're going to cry, could you move somewhere else? It's distracting when I'm trying to take a selfie." One day, the narcissistic high schooler Kazuki Umezono heads behind the school building to take selfies, where he encounters Erina Kirimura, a girl being bullied. Trying to prove the strength of his self-love, he steps in and interferes with the bullying—only for the situation to actually get resolved. As a result, Kirimura becomes deeply grateful to him. Then, half a year later, a beautiful girl calling herself his "believer" suddenly appears before Umezono. That girl was none other than Kirimura, the same girl Umezono had (inadvertently) saved! While Umezono schemes to keep some distance from the clingy Kirimura, more and more people begin gathering around him in ways he never intended... A romantic comedy about a narcissistic loner high school boy and the perfect beauty who absolutely adores him! (Source: Kodansha, translated)