Oshi ga Tonari de Netemashite

"This isn't a dream—we're talking about you staying with me for three months starting today." Shirai Hatsuka, a high school student who's been avoiding romance since her childhood friend's heartbreak, spends her days finding solace in her admiration for Yanase Ori, a classmate who's incredibly popular at school for his mysterious and cool personality. Then, while her parents are away on a business trip abroad, Hatsuka is sent to stay with an acquaintance. When she wakes up the day after moving in, she finds Ori sleeping beside her...!? And then Ori gently touches Hatsuka, who has jumped up in surprise, saying, "Good morning, Shirai-san"—. Her unexpected cohabitation with her idol begins...!?

(Source: Starts Publishing, translated)