RenAI Flag: AI ga Risou no Koibito wo Erande Kureru Matching App wo Tsukattara Isekai no Yuusha to Matching shita

Ryouta Midou was thrilled about his long awaited campus life but lamenting his inability to get a girlfriend. When his friend recommended the matching app RenAI Flag, he scored a huge match with Lilia, a blonde beauty! But it turns out 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 love life!

(Source: Ichijinsha, translated)