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|Other Name(s):||Kaii Sera (Pen Name)|
|Occupation:||Work as a personal doctor for his maternal Grandma [Citation Needed]|
|Relative(s):|| Takamasa Iki (father)|
Sayuri Iki (mother)
Hiyori Iki (younger sister)
|Manga Debut:||Chapter 51 (Vaguely shown, but not named)|
|Anime Debut:||Episode 5 (Briefly mentioned by Hiyori)|
Masaomi Iki (壱岐 正臣 Iki Masaomi) is the older brother of Iki Hiyori who is implied that he had been staying overseas shortly after graduating college, which was when Hiyori was a young child and it also implies that there is quite the age gap between the two. At that time, he told Hiyori that it was okay to run away if things got too hard for her. He encouraged her to do her own thing rather than becoming a doctor like their father. He has recently returned home, and works under the alias "Kaii Sera" as an Art Director Designer for a side job. His family did not seem to have knowledge of this. Due to his appearance having changed since being away, his family also did not recognize him upon his return. His hair had grown out, and he now wears glasses--suspiciously so, as he did not before leaving home and his family has no visible history of poor eyesight.
- Sensing Creatures From Far Shore: Unlike normal humans, Masaomi and his sister can sense, hear and see the creatures from far shore. They have inherited the ability to see beings of the far shore from their maternal family. This is explained by their grandmother in Chapter 54. His first encounter with Yato is when he asks for his friend, who is later revealed to be a spirit, to be rescued.