Reincarnation Dark Knights

An unpopular virgin dies and is reincarnated in another world as Solute, an impossibly handsome young knight. With a new face, a powerful body and an entire fantasy world ahead of him, Solute might finally have the chance to accomplish the one thing he never managed in his previous life: lose his virginity. Unfortunately, there's a problem. Solute has reincarnated as a member of the Dark Knight Order, an elite military organization whose incredible strength comes from contracts with demons. And the demon empowering Solute's order demands a very particular price for that strength. Every single member must remain a virgin. Worse, their chastity isn't merely a personal secret. If anyone outside the Dark Knight Order discovers that one of its members is a virgin, that knight will die. So Solute finds himself trapped in an absurd contradiction. He's finally reincarnated as the kind of handsome fantasy knight who could actually attract women, but the organization keeping him alive requires him to remain a virgin while simultaneously making sure nobody realizes that he is one. And when the Dark Knight Order marches into battle, Solute discovers that they're far from the only people in this world deriving supernatural powers from contracts with demons. Enemy contractors wield terrifying abilities of their own, the supposedly invincible Dark Knights begin falling before overwhelming opponents, and Solute's carefully guarded purity may turn out to possess powers even his comrades never expected.

An irreverent isekai battle comedy about a former loser reincarnated as a gorgeous fantasy knight whose greatest source of supernatural power is the one thing he desperately wanted to get rid of: his virginity.