An Koshi appears in the *Cream Lemon* series as an orange-haired student with petrol-colored eyes, born on March 3rd. She engages in an intimate nude roleplay with Kyan Hitomi. During this encounter, An Koshi lifts Hitomi's skirt and removes her underwear. An Koshi subsequently invites Rami Ichimonji to join them, leading to a three-way encounter involving An Koshi, Kyan Hitomi, and another woman.