Just an ordinary teenager, Kobeni Yonomori receives quite the surprise on her 16th birthday—a fiancé and a sister-in-law she never even knew she had. As a result of an arrangement that her late grandfather made, Hakuya Mitsumine and his younger sister Mashiro have moved from their countryside home to the Yonomori household in order to deepen their relationship with their new family members. This story follows Kobeni's "love life" with Hakuya as she tries her best to adjust to the abrupt changes forced upon her. However, as some extraordinary secrets regarding the siblings come to light, Kobeni will find her life changed forever.
Aimi
Mayura Momouchi (voice)
Asuka Kakumoto
Niko Oono (voice)
Yui Watanabe
Akane Yonomori (voice)
Yuri Komagata
Shirayuki Mitsumine (voice)
Saki Fujita
Konoha Suetsugi (voice)
Wataru Hatano
Hakuya Mitsumine (voice)
Haruka Terui
Kobeni Yonomori (voice)
Ayane Sakura
Nadeshiko Kashima (voice)
Eriko Matsui
Benio Yonomori (voice)
Yu-ri Yoshida
Mashiro Mitsumine (voice)
