Arc 5Victory and New Alliances
Yunyi led First High School to victory at the Nine Schools Competition, exposed a terrorist branch, and grew closer to Mayumi as she moved in with him. After introducing Mayumi to his mother, Shen Yi, Yunyi left the arc preparing to challenge the military-focused magic system while Mayumi’s sisters questioned their relationship.
- Yunyi swept through the Nine Schools Competition finals, defeating Third High School and helping Mayumi win Mirage Bat before First High School claimed the overall championship.
- Yunyi captured No Head Dragon’s branch leaders and asked Mayumi Saegusa and Katsuto Jumonji to deal with infiltrators on the organizing committee.
- Yunyi and Mayumi made their relationship public, and Mayumi’s father, Koichi Saegusa, agreed to stop opposing them as she asked to move in with Yunyi.
- Mayumi moved into Yunyi’s house with Kasumi Saegusa and Izumi Saegusa, while Yunyi refused Grand Master Kudou’s attempt to recruit him through the Ichijo Family.
- Yunyi helped Shizuku Kitayama overcome Miyuki Shiba in a magic practice match, then criticized First High School for preparing students to serve the military instead of teaching them to use magic for everyday life.
- Yunyi took Mayumi to meet Shen Yi aboard a ship in the Atlantic Ocean, where Mayumi said she would give up her Saegusa identity to be with him and Shen Yi considered how she could take control of the family.
- After Yunyi and Mayumi returned home, Kasumi and Izumi questioned whether Yunyi had tricked or threatened Mayumi into dating him.