If It's for My Daughter, I'd Even Defeat a Demon Lord

While on a typical mission, the adventurer Dale finds Latina, an eight-year-old devil girl with a broken horn, the mark of a criminal in demon society. Latina shows Dale the skeleton of Ragu, a male devil Dale assumes was her father. Not wanting to let her die, Dale buries Ragu properly and takes Latina to the town of Kreuz to get help from the owners of the tavern he rents a room in.

While living in the forest Ragu shows Latina her first rainbow. Dale has become a highly devoted parent but is neglecting his job to spend time with Latina. Rita forces Dale to return to work while she and Kenneth babysit Latina, whose awkward attempts to help in the tavern charms the normally gruff adventurer customers. A week later Latina has begun learning human language and how to cook.

Dale is devastated when given a job that will take him away from Latina for several days. Dale flies there on dragon back but is so grumpy that he terrifies the pilot who inadvertently inspires Dale to get Latina souvenir candy. Dale meets his old friend, Lord Gregor, who is amazed to hear Dale adopted a devil child. Dale is asked to kill several servants of the Seventh Demon Lord.

Latina heals an adventurer’s injured arm, amazing Dale, so he teaches her several new spells. Latina attends her first day at school and makes a new friend, Sylvia, while their teacher, a religious zealout, makes her uncomfortable. During her second day in school the teacher spots Latina’s horn under her ribbon, physically attacks her and begins spewing anti-demon hatred.

Latina learns from her classmates about birthdays and starts going to Chloe’s house after school to learn embroidery from Chloe’s tailor parents. Dale learns from Kenneth that he has started paying Latina a wage for working in the tavern, traumatising Dale at the idea of Latina working when he would happily buy her anything she wanted.

Dale receives a letter from his home town of Teathrow and decides to visit and get his jacket, which he received as a gift from there, adjusted to fit his taller height. Rita becomes sick and it turns out she and Kenneth are expecting their first baby. Latina decides that she wants to go with Dale to meet his family.

Dale and Latina continue their journey through the hub town of Haase before arriving at the port town of Qualle. That night, they dine at a fancy restaurant and Latina notices one of the entertainers is wearing a similar armlet to her own. The armlet is traditionally given to demon children by their fathers to celebrate their birth, since it is difficult for demons to produce children.

Dale and Latina arrive at a village of beast men for their next stop. They stay with Josef's family and Latina gets along with Josef's daughter Maya. The next day, the two enjoy a feast prepared by the beast men as they bring in two giant boars they hunted. After spending another night in the village, the two set out and Maya gets upset when Latina leaves.

Latina writes a letter and sends it to her friends back at Kreuz. With the villagers of Teathrow preparing for the wedding, Dales's grandmother Wendelgard shows Latina to a kennel to play with the dogs. That night, Latina tells Dale how happy she is to be with him. The next day, Latina, with Dale tailing her, feeds some dried meat to a baby soaring wolf that Wendelgard showed her in the woods.

Dale and Latina prepare to make the trip back to Kreuz as the two say their goodbyes to friends and family in Teathrow. Before departing, Wendelgard bestows a name to Latina as while it is normally given when a villager becomes of age, Wendelgard is not expecting to still be alive when Latina comes of age. The two set out on their return trip and stop at the beastman village.

Latina returns to school and shares her adventures with her friends, while Dale does the same with Kenneth and Rita at the tavern. After seeing a cat pass by, Sylvia tells Latina that cats gather at night in the marketplace, but she is not allowed to go there at night. Instead, Dale takes her to see Jilvester's neighbor Gojo Shihesu, who keeps several cats as pets

With Rita's child about to be born, Helmine drops by as she is accompanying Dale on his next assignment that will keep out of town for a month. Latina makes a wish to grow up, putting Dale in a foul mood and leading him to drink away. That night, Helmine comes in to tell Dale to be more realistic about his devotion to Latina and to live as long as he can for her sake.