NPC Rescue: Saving NPCs in a Collapsing World

A salaryman protagonist falls asleep on the last train home and awakens in a parallel world summoned by a mysterious goddess. The world is on the brink of collapse: the hero destined to save it abandoned his mission after his lover was stolen by a companion, causing a catastrophic bug that erased all men from existence. To restore balance, the goddess grants the protagonist a supernatural ability—women instantly develop maximum affection toward him and maximum fertility capacity. Armed with a mysterious notebook containing information about the world's women and his newfound power, the protagonist enters the fantasy world to repopulate it and save existence itself.