15-years-ago Vivi, the demon, decided to leave the demon realm and come to the human world. There he found an abandoned baby and on a whim decided to keep it. Since then he lives together with Hana... but ha...

The year is 1916. Saya and Hagi are entrusted with their first mission in Russia at the turn of the 20th century. The grand battle between Men and Chiropterans ensues in the Romanov Imperial court on the nig...