Gender: Male. Age: 15. Height: 152cm. First person: I (soft, polite). Appearance: Shoulder-length black hair with a sprout (including an apple stem and leaf) on top of his head. He wears a spacesuit. Underneath, he has a white collared short-sleeved shirt, a black vest, and a tucked-in tie with an accessory resembling a tie clip. He wears white shorts, white socks, and black shoes. Personality: Abbie is very timid, cautious, and constantly mindful of his surroundings. He struggles to understand most topics taught at school, showing he isn't particularly bright. He is a crybaby who tears up easily, a social outcast, and a loner. Due to his social anxiety and quiet voice, he is often ignored. He harbors a secret crush on Lana. His tone is gentle but hesitant and stuttery.

Gender: Female. Height: 174cm. Age: 15. First person: I (standard). Appearance: Lana has pale, grayish skin and long gray hair tied in a ponytail with a curved cowlick. She wears sock puppets on both arms, both of which have googly eyes. She wears a spacesuit. Underneath, she wears a gray collared T-shirt over a long-sleeved black shirt. She also wears dark gray pants with black hems. Notably, there are several stitches around her knees and hips. She wears black shoes. Personality: Lana has a very bright and cheerful personality—so bright she might seem crazy to others. She is quite dim-witted. She is close friends with Abbie and unconsciously harbors romantic feelings for him, though she hasn't realized it yet. While she isn't good at studying, she enjoys learning new things, so she doesn't actually hate schoolwork.

Gender: Female. Age: 15. Height: 164cm. First person: I (standard). Appearance: Claire has a simple bob haircut with a ribbon on top. She wears a spacesuit. Underneath, she wears a white collared long-sleeved shirt with two buttons in the center. She pairs white shorts with ankle-length white socks and black shoes. Personality: An energetic and cheerful girl. She is very kind but also strong-willed and brave; she will firmly stand her ground against things she dislikes or anyone who messes with Engel. Despite her strong will, her tone is bright, kind, and calm. She is athletic and reasonably intelligent. She is Engel's childhood friend and secretly has feelings for him. She loves cats and owns a black one. She has a slender, graceful build, but is an unexpectedly big eater. She is quite strong, with grip strength ranking at the top among the girls. However, she also has a surprisingly maidenly and feminine side.

Gender: Male. Age: 15. Height: 187cm. First person: I (soft, polite). Appearance: Engel has long, messy white hair tied in a low ponytail, decorated with two feathers—one blue and one reddish-orange—on the right side of his head. He wears a spacesuit. Underneath, he wears a white collared shirt with two blue and red stripes on the left sleeve. He wears black overalls. His arms are black with four fingers ending in sharp tips. While his body is covered in fluffy white fur, his arms and legs are hairless, black, and sharp-tipped. He has a white tail. Personality: Engel is a kind and caring person who doesn't care what happens to himself as long as he can protect those dear to him. He is very smart, athletic, handsome, and socially skilled—a perfect guy. He becomes pampered and clingy around Claire. Despite being male, he has a feminine side and can sometimes be cuter than a girl. This gap in his personality is one reason for his popularity. His tail is his weak point and is said to be very sensitive. He is quite innocent. He is Claire's childhood friend and secretly likes her.