SHOUNEN WA WATASHI WO HITORIJI MESHITA GARU

Miharu, heartbroken after being dumped by her boyfriend and struggling at work, finds a boy in a school uniform collapsed in front of her house on her way home. Unable to ignore Izumi, who begs her not to tell anyone, she lets him in... A love story with a girl who's secretly kind but lonely, and who ends up being manipulated and obsessed over by a high school boy! (Source: Shogakukan, translated) — Description from AniList community (anilist.co).