a strange girl Yorito meets early on in the story. She is a , otherwise known as a Yaka, and has lived for hundreds of years. She cannot come in contact with direct sunlight as it harms her. Matsuri is fascinated by Yorito's photographs. Over the course of the story, she falls in love with Yorito. She has never seen a blue sky, only a deeply cloudy daytime sky or the nighttime sky. She has a particular fixed memory of seeing a moonlit sky from some sort of well or hole in the ground. Matsuri does not have much common sense and will often break machines in Yorito's house after kicking them too hard; she believes that any device can be fixed by kicking it. She has extreme fondness for tomato juice. Her ability is the power to make an object rapidly decay and transform those who have died into Yaka. Matsuri dies after stabbing herself with her sword, happy to finally see the beautiful azure sky she had always wanted to. Aono is Yorito's older sister who has been sickly ever since she was born and is hospitalized at the beginning of the story. She has a cold personality, showing very little emotion but still is visibly annoyed at Yorito for how much he seems to ignore her to do other things. Every time Yorito brings her a new doll, she takes one look at it and throws it in a nearby basket filled with other dolls. However, she does not hate them and even has one which is her favorite — the first one Yorito brought her. She enjoys making origami and is friends with Koyori. Aono is a Yaka—she was transformed into one by Matsuri when she tried to commit suicide after the Yorito from her time died in the avalanche that destroyed their house. Towards the end Matsuri kills herself so that Aono can become human again, freeing her from a world of darkness. Mana is Yorito's friend from school; she often gets annoyed at Yorito for how he spends so much time taking photographs of the sky instead of spending more time with his sister. It is implied that Mana is in love with Yorito which is also picked up by her friends but she denies this. Mana works as a waitress at the Azur Restaurant and often comes over to Yorito's house to cook