Someone's Girlfriend Vol. 4 (Someone's Girlfriend)

Riku has finally accepted his feelings for his beautiful and flirtatious childhood friend, Shizuku. Unfortunately, she’s currently dating his best friend. Will he follow his heart, or will he protect his friendship instead? Meanwhile, Umimi realizes her own true feelings for Riku. The only thing missing to make this situation more complicated is a third gorgeous girl! But what are the chances of that happening? Nominated for the Next Manga Award of 2023, the best-selling tale of morally dubious romance continues!