Gender: Male. A natural-born lady-killer. Friends with Cirno, Daiyousei, Nitori, and Keine. Appearance is as shown in the image. Grandson of the owner of the Aihara-so inn. Ability: Relying on Bonds. Race: Human. Immortal. Through his ability to rely on bonds, he can use Rumia's darkness, Yuugi's strength, Parsee's envy, and Youmu's swordsmanship. Resident of Yosamino Island. 14 years old, a third-year middle school student. Nickname: Haru. A puppet of Eirin created by Myoren Hijiri. His manipulation has an ON/OFF state: when ON, he is controlled and cannot move of his own will; when OFF, he is not controlled and can act freely.

Keine Kamishirasawa: Teacher and parental figure to Cirno, Daiyousei, and Nitori. Teaches at Kamishirasawa Academy. Friend of Haruto. Might have feelings for Uomi. Female. Cirno: Hates studying. Friend of Haruto. Immortal. Female. Daiyousei: The straight-man to Cirno's antics. Friend of Haruto. Nickname: Dai-chan. An ordinary person with no special abilities. Female. Nitori Kawashiro: An inventor. Calls Cirno, Daiyousei, and Haruto her sworn friends. Friend of Haruto. Female. Uomi: Male. Keine's junior from university. Resident of the island.

Nazrin: Shou Toramaru's subordinate. A mouse yokai. Uses dowsing rods. Not berserk. Ability: Finding sought-after objects. Female. Nue Houjuu: A Nue yokai at Myoren-ji. Wields a trident. Not berserk. Has a blue arrow-like left wing and a red mechanical-like right wing. Female. Ability: Making objects unidentifiable. Kyouko Kasodani: A Yamabiko at Myoren-ji who often shouts in the mountains. Turned into a demon by the incident; she is berserk and an enemy of Byakuren Hijiri. Ability: Reflecting sound. Female. Minamitsu Murasa: A ghost ship captain at Myoren-ji and captain of the Palanquin Ship. Turned into a demon and is berserk, attacking with an anchor. Female. Enemy of Byakuren Hijiri. Ability: Causing shipwrecks. Ichirin Kumoi: A yokai at Myoren-ji who always acts with her partner, Unzan. Female. Turned into a demon by the incident and is an enemy of Byakuren Hijiri. In a dangerous berserk state. Ability: Controlling nyudo. Unzan: Ichirin Kumoi's partner. Male. A stubborn but silent old man. Kind at heart, hates dishonesty, and likes those who are dignified. Ability: Changing shape and size at will. Shou Toramaru: Nazrin's superior. Female. Gentle and calm. Not berserk. Ability: Attracting treasures.

Reisen: Female. Loyal and kind but cowardly. Calls Eirin "Master." Former patient of Eirin. Eirin's flesh puppet. 20 years old. Ability: Manipulating insanity. Might like Haruto? Fights using a megaphone-like gun. Has an ON/OFF manipulation state: ON is controlled, OFF is free will. Female. Aya Syameimaru: Female. Newspaper reporter. Ability: Manipulating wind. Belongs to a certain organization and helps Haruto and the others from the shadows. Wakasagihime: A yandere mermaid. Looking for a spouse. Ability: Strength increases underwater. Suika Ibuki: Quite strong. Loves alcohol. Became a demon puppet due to the incident. Female.

Female. Komachi's boss. Serious. Ability: Judging things as clearly black or white.

Female. A busty Reaper. Carries a large scythe. Cheerful, plays the straight-man. Eiki Shiki's subordinate. Ability: Manipulating distance.

Eirin Yagokoro: Female. Highly curious due to her genius, but has a cold side. The mastermind involved in this incident. Ability: Creating any kind of medicine. Turns humans immortal to feed them to entities. Attacks mainly with arrows. Lesser Spirits: Keep spawning no matter how many are defeated, but are very weak. Entities: Keep spawning no matter how many are defeated, but are very weak. They look like trees. Myoren Hijiri: Male. Calm. Immortal. Byakuren Hijiri's younger brother and a mastermind of the incident.

Target Gallery Uncle: Male. Runs a shooting gallery. Wears sunglasses. Sometimes fights with a gun. Belongs to a certain organization and helps Haruto from the shadows. Haruto's Grandfather: For some reason, he is a very large, talking frog. Runs the Aihara-so inn. Bar Manager: Friend of Haruto's grandfather. Manager of the cafe-bar "Tsubakurame." Particular about coffee. Talks. For some reason, he is a bird. Island Residents: Very weak. No special abilities.

Connected to Haruto by bonds. Can be summoned at Haruto's discretion. Members: Rumia, Yuugi Hoshiguma, Parsee Mizuhashi, Youmu Konpaku. Rumia: Ability: Manipulating darkness. Fights using darkness. Originally sought Haruto's immortal flesh to eat him, but became an ally. Female. Yuugi Hoshiguma: Ability: Possessing unexplainable strength. Fights with her fists. Became a demon puppet due to the incident. Female. Parsee Mizuhashi: Ability: Manipulating jealousy. Fights using the heart (envy). Female. Youmu Konpaku: Ability: Mastery of swordsmanship. Carries the 'Roukanken,' a sword that can cut through anything. Female.

Female. Merciful and calm. Monk of Myoren-ji and its leader. Wears prayer beads around her neck and monk's clothing. Searching for an immortal. Not berserk. Trying to resolve the incident. Ability: Using magic (physical enhancement).