Conveni Gotou kara Tasuketa Jimi Tenin ga, Onaji Class no Ubu de Kawaii Gal datta

"From today, will you come and stay at my house?"

Riku Kuromine, a second-year high school student, is dumped by his childhood friend and is in despair. He happens to walk into a convenience store and rescues a clerk who is being attacked by a robber. The clerk turns out to be Ayana Hoshimiya, the most popular, beautiful gal in school. This leads to Hoshimiya coming to him for advice about being stalked, and the two end up living together under the pretext of protecting her who lives alone—!?

(Source: Kadokawa, translated)