A baseball bat-wielding adolescent randomly attacks five people in Tokyo, each of whom is grappling with a serious problem. Toy designer Tsukiko endures tremendous pressure to repeat her previous success; bottom-feeding journalist Kawazu desperately needs money. Popular sixth grader Yuuichi feels threatened by the new kid in his class, the dumpy nerd Usshi. Yuuichi's tutor Harumi is a compassionate scholar by day; at night, she becomes Maria, a sleazy hooker. The seemingly purposeless violence of Lil' Slugger (originally Shounen Bat, literally "Bat Boy"), also disrupts the lives of police detectives Maniwa and Karino, and their corrupt boss Hirukawa. As he did in Perfect Blue, Kon deliberately blurs the boundaries between reality and fantasy: Does Tsukikio's stuffed toy really talk to her? Which is Harumi's true personality?
Hikaru no Go
Shindou Hikaru, a 6th grader, finds an old go table in the attic of his grandfather's house. He sees some blood stains on the go table, and tries to wipe it off... when a ghost dressed in Heian period clothes pops out, and takes over his body.The ghost happens to be Fujiwara no Sai, a member of the court during the Heian period. Sai was one of the two men who was assigned as the go tutor to the emperor. The other tutor was envious of Sai, and challenged him to a go match - whoever wins gets to stay as the court's go master. Sai's opponent cheats during the match, and before Sai could say anything about it, the opponent accused Sai of cheating. Sai was banished from the court, and because of regret and anger, he committed suicide. But as with all unrepented souls, Sai was unable to leave the material world... until he is able to master go, and get one step closer to kami no itte, or god's hand.
Satsuki Manshita and her younger brother Keiichirou move from Tokyo to their mother's hometown. Not long after they move in, they discovered that the old abandoned school building near their new school is haunted by demons and evil spirits. At first, they don't seem want to get involved with it, not until their family cat, Kaya, is taken by a demon. In order to save the town, Satsuki and Keiichirou along with their new friends, Momoko, Leo and Hajime form a team to fight the demons.