Midou Ryouta, thrilled at the campus life he had longed for, was lamenting that he still couldn’t get a girlfriend at all. When he started using the matching app “Ren AI Flag” that a friend recommended, clinging to it as a last hope, he scored a huge match with Lilia, a beautiful blonde girl! But she was a hero who had come from another world! He was supposed to win her over, but he’s pressured into a relationship with marriage in mind—and on top of that, they end up living together!? The curtain rises on a slightly unusual youth romantic comedy about a male university student who longs for an ordinary romance!