vsphim-h00498 Nữ Sinh Tập 3

The story you're describing appears to be from the 2009 anime OVA series *Kanojo x Kanojo x Kanojo: Sanshimai to no DokiDoki Kyoudou Seikatsu* (often shortened to *Kanojo x Kanojo x Kanojo*). In this harem-style series, Kakeru does not choose just one girl by the end of the fourth episode. Instead, the conclusion shows him deciding to pursue relationships with all four—Urara, Rie, Hikari, and Aiko (the tough motorcycle girl)—leading to a polyamorous ending where they all live together. If this isn't the series you meant, feel free to provide more details!