After having several setbacks in real life because of his loner nature and holing up in his house, Toudesuke Saionji, a middle-aged man, throws himself into his inventions. Until, one day, he causes an explosion during one of his experiments and ends up reincarnating into another world. Now that Toudesuke has yet to find some way to go back to his old world, will he keep to himself along with Satalia, a vampire girl who adores him, and lead a quiet life where he dedicates his time to his inventions...?!

“I” who died in an accident in this world was reincarnated in a strange world when he woke up. Moreover, not humans but demons … He was attacked by a monster in a different world without knowing right or left, and was saved by Charlotte, the daughter of the Duke, after he managed to escape from his life. She is kind and innocent, and has been hurt by the so-called slanderous defamation since her sister-in-law Lily arrived. Then it’s my turn to save Charlotte!!!