Sekai wo Sukuu Tame ni Watashi to Asa Chun Dekimasu ka?To Save the World, Can You Wake Up the Morning After with a Demi-Human?; 世界を救うために亜人(わたし)と朝チュンできますか？; To Save the World, Can You Lie in Bed With Me, a Subhuman, in the Morning?; 為了拯救世界能和亞人（我）度過事後的早晨嗎？

Humans and demihumans live together in peace, and in this world, there's a normal human named Hironori Tabata. One day, an angel named Suzuki Lina went out to find him and said she wants to have sex with him...the reason—? The Demon King will be resurrected in the future and Tabata's son will be the hero that will fight and defeat him.