Kobeni Yonomori (夜ノ森 小紅Yonomori Kobeni?) is the protagonist of Mikakunin de Shinkokei series.
Kobeni is the "ultimate average high school first-year student." She handles auto insurance the cooking and all other household chores. On her 16th birthday, a young man named Hakuya Mitsumine and his little sister Mashiro Mitsumine suddenly appear in front of her. It turns out that Hakuya is her fiancé, and Mashiro is her future sister-in-law.