Kimi wa Koisuru Saioshi Liver

Tsukasa, a game character designer, is a long-time fan of Kirari Koi, a popular virtual streamer. One night, after a few too many drinks, Tsukasa accidentally breaks into someone else's room and encounters the resident, Ren. When he hears Ren's voice—a perfect mimic of Kirari Koi—Tsukasa is taken aback and accused of being a stalker fan for recognizing it. In a flustered attempt to explain himself, Tsukasa reveals his identity and says he’ll “do anything” to be forgiven. To his surprise, Ren responds, “Then become my lover...”

(Source: Kaiohsha, translated)

Note: Includes one extra chapter.