A ghost that resides in the Satsuki Dormitory. He prefers to reside within gaps very thin spaces that he is able to squeeze into such as the space between two pieces of furniture or a crack in a wall. When outside with Yachiko he generally hides himself inside her skirt. He appears to be unable to remain outside of gaps for too long. In a mission to gain a better understanding of girls Giko has been working on a girl dictionary for many years by observing and sometimes befriending girls and noting their behaviour. According to him his unfinished business as a ghost is to complete the dictionary and he will not disappear until this happens.