Choir～クァイア～

There used to be a man seeking "immortality". He uses his vast assents to conduct crazy experiments. As a result, "magic" was born. Magic needs a conductor in the form of a card. Mage acquired immortality but for the price of the need to search for new body each time and fall asleep for a long time afterwards. Last time he got into the body of a young Japanese man during Taisho era, and then fell asleep. He wakes up on October 2000...

[From vndbreview]