It's been 30 years since a dungeon was created in Japan.Kyoichi passed the same super-difficult high school as his childhood fiancé, Tsubaki, but... he was the subject of teasing in the class because he was rumored to have knelt down on his knees to a goblin.He searches the dungeon to reverse the situation, but is beaten down by a group of goblins.Thinking about his little sister tonight, he prepared himself for death...The dungeon ruler Kyoji helped me.And with this encounter, Iichi's destiny changes. Gets stronger every time you fight!The Musou dungeon walkthrough with my little sister opens!!