Sayoko Arashiyama

Arashi is Hajime's first friend he makes in the Ark. She and Hajime have a great rapport, as they often play together around the village, go on adventures with one another, or enact and improve silly skits that they understand but bewilders onlookers. She has a good sense of humour and a strong sense of righteousness. She is extremely close friends with Kaja. Arashi is very forgetful and is not very responsible, and does not think twice before doing things and especially does not weigh out the consequences of her actions. Arashi really is a ghost who is more than sixty years old.

She died during World War II and has since remained "alive" as a ghost who is capable of time travel once she comes into contact with some males she can "connect" with. She spends a lot of time at the Ark cafe and works there as a waitress. It is speculated that she has gone back in time with other people throughout the years to save people from her own time from the bombings during the war.