Kyou, a young man who lost his family and was living alone, ran into a man collapsed in front of his house. Thinking "It'd be troublesome if he dies here," Kyou let the man rest in house, but as soon as he came to, that man urged Kyou "Let me eat you!!"...?!
Turned out that man, Ren, is a demon!!! If he doesn't consume "human's energy" regularly, he'll die. He said "The energy generated when making love is the most delicious" and invited Kyou to have sex, but was flatly refused! Kyou wanted to drive Ren out soon, but he seldom had contact with other people so he ended up letting Ren stay for a while.
He thought Ren would be a troublesome existence, but he has been living alone for so long that spending lively days with Ren made his feelings for him start to grow, and Ren's existence became bigger and bigger. However, Kyou had a reason to not give Ren the "delicious energy"...

Naughty, friendly, hungry Devil x Traumatized, caring, handsome man.
Eaten and satisfied. A interspecies, caring love story between a demon and a human.