Yonaga Taizen
世永 泰然
| Yonaga Taizen世永 泰然AB | |
| Measurements | Height: 180cm |
| Birthday | 1 November |
| Eyes | Garnet, Red |
| Body | Pale, Slim, Teen |
| Clothes | Cardigan, Choker, Jacket, Necklace, School Uniform, Swim Shorts, Vest |
| Personality | Friendly, Jealous |
| Role | Childhood Friend, Classmate, Roommate, Wealthy |
| Engages in | Teasing |
| Visual novels | Side character - Kamidanomi Shisugite Ore no Mirai ga Yabai. |
| Voiced by | Margarine Tengu |
DescriptionHajime's roommate, as well as his and Mao's childhood friend. | |