|Eye Colour||Golden Yellow|
|Residence||Ministry of Spirit Affairs Headquarters|
|Manga Debut||Chapter 1|
|Anime Debut||Episode 1|
Kei Agemaki is one of the seven main characters in this series and is a second lieutenant, his yōkai partner is Zakuro. He is always seen with Zakuro who is also his love interest in this series.
Agemaki is described as a wimp by Zakuro mainly due to the fact that he is afraid of spirits and is always being saved by her. Agemaki tries his best to get along with Zakuro but everytime he does Zakuro ends up stepping on his foot. Agemaki is kind hearted but a bit of a klutz.
Agemaki is often described as looking like a prince or gentleman. He is tall, fit, and attractive man with medium length blond hair and golden eyes.
Agemaki and Zakuro have an on and off relationship, the two always deny having feelings for each other whenever asked. Agemaki always tries his best to get along with Zakuro but ends up saying the wrong thing resulting in an angry Zakuro. Agemaki gets jealous of Zakuro easily when she's with other guys, such as Hanadate. He mumbles things to himself when Hanadate is around Zakuro since he's never admit to her that he's jealous. He finally is able to confess to her and they end up kissing.
Agemaki and Susukihotaru are quite friendly, which usually ends up making people question what their relationship is. Susukihotaru and Agemaki end up being kidnapped by the enemy and they both argue over who will save the other, Susukihotaru usually questions Agemaki on his feelings for Zakuro even though she can already tell he likes Zakuro.
Agemaki usually plays with Sakura and Kiri due to their constant demands about it. Agemaki, Sakura, and Kiri have a father and child like relationship. Agemaki was scared of them at first though due to them being pumpkin head spirits, and because they usually catch him by surprise.
Agemaki and Riken are good friends, as seen in the anime where they are usually seen training together when they aren't on a mission with their partners. Riken and Agemaki are constantly conversing and the two seem to get along great, much like Susukihotaru and Zakuro's relationship.
Agemaki has no special ability , although Agemaki is proficient with the sword since he was able to last against the half spirit, Daidai, for a short period of time. He is only seen fighting a few times. Agemaki is also good with his hands as he fixed Zakuro's broken pendant.