Eientei, a magnificent estate, is tucked away within the Bamboo Forest of the Lost in Gensokyo. Here, Princess Kaguya Houraisan and her trusted advisor, Eirin Yagokoro, reside. Together with their youkai rabbit companions, led by Earth rabbit Tewi Inaba and Moon rabbit Reisen Udongein Inaba, they guard and keep the Princess safe. However, their primary task is to prepare mochi every month to celebrate the Moon Festival, Reigetsusai.
There is never a dull moment within the walls of Eientei, despite its remote location. Be it Kaguya's intense rivalry with Fujiwara no Mokou, Tewi's playful pranks or Reisen's sullen disposition, there is always an abundance of amusement and laughter to be had.