Kanojo ga Harem wo Susumete Kuru.

On the surface, Daiki Komada is the definition of unremarkable. With a face that wouldn't turn heads and an unassuming presence, he seems like your average college student. Beneath that mundane exterior, however, he possesses two notable assets: nearly limitless stamina and a physical endowment that more than compensates for his plain looks. Yet even he is baffled as to why he managed to land a girlfriend so breathtakingly beautiful that she is the envy of every man who sees her. The turning point comes after one particularly intense and passionate evening with her. In the languid aftermath, she drops a proposition so shocking it upends his ordinary life: she suggests he find himself a "fuck buddy." Her reasoning is startlingly pragmatic—his sexual prowess is so overwhelming that the physical and emotional toll it takes on her is simply too much to handle on a regular basis. That single conversation becomes the catalyst for an avalanche of desire. One by one, a procession of stunning and unique women begins seeking him out for the very same reason. Among them are his college-student childhood friend, who boasts a figure worthy of a runway model; a voluptuous working woman who already has a boyfriend; and a former idol who has reinvented herself as a popular video streamer. Before Daiki knows it, the trickle of attention has swelled into an unmanageable flood, and he finds himself at the center of an ever-growing harem of beauties far beyond anything he could have ever dreamed—or feared.