In the beautiful land of Astraea where a gentle wind strikes, a boy called Yuuki awakens with no memory of his past. There he comes across a guide who has actually sworn to care for him-- Kokkoro, a lovely swordswoman that's constantly feeling peckish-- Pecorine, and also a cat-eared hag with a prickly attitude-- Karyl. Led by destiny, these four integrated to form the "Exquisite Guild." Therefore their experience begins ...