Isafuyu is an individual who serves as the daughter of a priest at mapputatsu temple. she possesses a reserved demeanor, which becomes apparent when she first encounters baby beel during her introduction to oga and others at the temple. initially terrified by his true nature, kunieda seeks isafuyu's assistance in learning how to combat demons alongside oga and tojou. in order to aid kunieda, isafuyu introduces him to koma, a demon residing near mapputatsu shrine.
isafuyu is spiritually attuned and capable of discerning the presence of demons through visual inspection. she accurately identified baby beel as a powerful demon during their initial encounter. in addition to detecting demons, she can also perceive ghosts and perform exorcisms on both entities. koma collaborated with her in combating demons.