Love Grimoire ~The World Is Doomed Unless the Ultimate Virgin Hero Gets Married~Love Grimoire: Saikyou Doutei no Yuusha-sama ga Kekkon shinai to Sekai wa Metsubousurusou desu~; 恋愛グリモワール～最強童貞の勇者様が結婚しないと世界は滅亡するそうです～; Renai Grimoire: Saikyou Doutei no Yuusha-sama ga Kekkon Shinai to Sekai wa Metsubou suru Sou desu

The hero had finally defeated the demon lord, sealing him. However, the seal he had used was only temporary. Should evil rise again, the descendants of the hero shall follow in his steps. At least... That was the plan. It's too bad that the hero is still a virgin! If he doesn't have children by 30, he'll become a wizard! And so, the hero desperately begins his journey to find a wife...