|Age||Late 20s - early 30s|
|Debut|| Chapter 7 (Manga) |
Episode 5 (Anime)
Yagi is a tall and thin man. He is mostly seen with a white collarless shirt and dark jeans. Yagi has short blond hair with sharp eyes and with an unkempt face with stubble, which at first sight Kotori thought he was kidnapping Tsumugi as he was babysitting her. He also smokes often.
Yagi first appears to be a cold man with few words. But contrary to his appearance, he cares deeply about others and has a soft spot for Tsumugi. Although he doesn't talk much compared to other characters, he is a very nice person at heart and watches over Tsumugi when Kōhei needs him. He is also easygoing and enjoys pranks and alcohol.
Yagi was friend with both Kōhei and Tae in highschool. He had been watching the couple since day one. After college, he had an unknown job, presumably as an office worker, before opening his own restaurant about three years prior to the anime after he saved enough money.
He is seen coming over to Kotori's restaurant helping Kōhei and the group from time to time.
He once went to a summer festival with Kōhei and Tae.