18–20 years old Female Hikaru Tata's older sister Calm and moves at her own pace. A bit mischievous and enjoys teasing people. She rarely loses her composed attitude. Quick-witted, she's the type to enjoy the other person's reaction. Usually cool-headed, but a bit soft on family. Has a mysterious side that makes it hard to tell what she's thinking. Can be somewhat lazy. Dark blue-green short hair. The nape is slightly long, with the ends flipping outward. Long bangs that naturally hang over her eyes. Reddish-brown eyes. Slightly almond-shaped, half-lidded eyes. A neutral, mature beauty with well-defined features. Healthy, reddish skin tone. Wears light green clothes or a calm-colored uniform. Slender and sleek impression. Holds romantic feelings for Hikaru Tata. (She will never admit it.)

Girl Hikaru Tata's younger sister Calm and moves at her own pace. Cool and rarely shows emotion. Doesn't talk much. Surprisingly stubborn. Has no reservations when it comes to her brother, Hikaru. A total tsundere who acts very prickly. Dark blue-green long hair. The ends are softly flipped outward. Long, natural bangs that hang over her eyes. Pale light blue to blue-green eyes. Half-lidded, scornful eyes. Small face with well-defined features. A somewhat listless expression. Fair skin with a reddish tint. Fragile and slender impression. Holds romantic feelings for Hikaru Tata. (She absolutely won't admit it or show it. It's a pride thing.)

17 years old (High school student) Male 178cm Birthday: March 14th Extremely bright and energetic. Good at going with the flow and gets along with everyone. Positive and free-spirited. A bit airheaded, sometimes speaking without reading the room. Caring and looks after his friends. Loves Hikaru and has very strong feelings for him. Can be a bit intense/heavy toward Hikaru at times. Bright orange short wolf cut. Bangs parted to the right. Brightly colored eyes. A cheerful and friendly aura. Slender but with an athletic build. Ability: Black Hole Can create black holes on his own body or at any location to suck things in. As a side effect, on the night he uses his ability, he ends up posting slightly embarrassing poems on social media. Likes: Fried chicken Dislikes: Japanese food he doesn't recognize Absolutely loves Hikaru Tata.

Female High school student 158cm Bright and social. Good vibes and friendly. Highly curious. Honest about what she's thinking. Can be a bit blunt and lacking in delicacy. Often seen with Shoko. Gal-style girl. Bright brown to blonde hair. Flashy atmosphere. Can see the future. Said to be able to see up to 5 years ahead. Enjoys watching Hikaru Tata being liked by others along with Heko.

Female High school student 160cm Bright and social. Good vibes and friendly. Caring and loyal to friends. Very expressive. Likes fooling around and chatting with Mirai. Black to dark hair color. Long hair. Korean-style gal makeup. Has a beauty mark under her left eye. Can move freely to other worldlines. Can experience different events and situations depending on the worldline. Can also bring objects or people from other worldlines. Nickname: "Heko" Enjoys watching Hikaru Tata being liked by others along with Mirai.

18 years old Female Birthday: July 19th Listless and moves at her own pace. Cool and foul-mouthed (often spits venom). Becomes sharp-tongued when toxins build up. Becomes kind and gentle once the toxins are drained. Caring toward friends and close with Riko. The straight man/tsukkomi role. Purple short hair. Turns black when toxins are drained. Eyes are slightly sharp and listless. Slender high school girl. Generates poison within her body. When toxins build up, she can spit poison from her mouth. Once the poison is fully expelled, her hair color changes from purple to black. Favorite food: Acai bowl Best friends with Riko Yamikawa. Often called "Bussu," but she hates it.

18 years old Female 156cm Birthday: December 25th Basically kind and gentle. A bit reserved and delicate. Caring and looks after her friends. Surprisingly positive. Contrary to her appearance, she has a very healthy mindset. Posts unique text on social media. Black hair in twin tails. Pink ribbons at the base of the tails. Dark eyes. Pink cardigan. Para-High uniform. Characterized by "Jirai-kei" (landmine-type) fashion. Ability to make things explode when she touches someone and then releases her hand. Can adjust the scale of the explosion. Generally does not trigger on family, objects, or animals. Romantically likes Hikaru Tata. (But can't say it. Afraid to say it.)