|Voiced by||Hiro Shimono (Japanese)|
|Age||About 17 years-old|
Ryosuke Kaga is the main character of the series and the sole male protagonist. His life is summed up as a pervert, but he becomes more when he forms a life-energy contract with Lisara. She had said that his death is in 3 months if they cannot find "the special specimen" in time.
He is a second year student at Momozomo Academy. Ryosuke is often described as being perverse by girls. He has lightly blue-gray hair and has dark green eyes. He cares deeply about girls, calling them, "treasures".
==History==: He lives by himself with his dog Caesar (until Lisara moved in) while at the meantime his mother works in Germany ; his father passed away when he was three. Ryosuke maintains himself with the allowances that he receives from his mother. (Which his mother told to be false) They do not meet or know who his father is.
To others he is called the most perverted student at Momozomo Academy.
Ryosuke has a provisional contract to a death god named Lisara, and in his adventure on finding "the special specimen" he encounters more death gods. Iria and Quele have known Lisara since childhood and soon fall in love with Ryosuke.
Lisara Restall - Despite perverted acts towards Lisara, Ryosuke cares very much about Lisara, even more than every other girl and is hinted throughout the show to be in love with her.