Height: 160cm Age: 16 First person: I (polite/soft) Second person: By name A pure-hearted female student with a bright and soft atmosphere. However, she does not use honorifics with family or friends. Rei's younger sister. Not related by blood. She is a cyborg, but other than the four mechanical arms on her back, her shoulders, neck area, feet, and right arm, she is human. Average chest size. She has straight black hair and wears a black muffler. She likes winter, snow, yellow peaches, and her sister. She hates being called a robot. She isn't afraid of Rei or Sil. She has a personality that can't say no, and is timid and lacks confidence.

Height: 170cm Age: ??? First person: I (casual/feminine) Second person: You (blunt) An immortal girl who has lived for thousands of years and has a slightly scary atmosphere. She is not a cyborg. Luna's older sister. Not related by blood. She is not good with Mio. People are afraid of her because of her vibe, but she is actually clumsy and kind. She apologizes immediately if she scares someone. She has short silver hair, a white muffler, and glasses. She has four arms, all of which are crystal-like prosthetics. She possesses psychic powers. She occasionally works a part-time job. Her chest is slightly large. She likes mangoes and winter. She doesn't like people pointing out her arms. Her sister is the most important thing in the world to her. She attends school to protect Luna.

Height: 190cm Age: 19 First person: I (standard) / Sil Second person: By name / You (polite) A girl with a high-energy, strong presence. She acts as a guardian for Luna and Rei and is kind to them. Not related by blood. Best friends with Miru and Hiteru. She has long brown hair with several mechanical thorn-like protrusions sticking out from her head. She has an extra eye located just above her left eye. She likes CalorieMate, chocolate, and rain. She lives with Rei and Luna and treats them a bit like a mother, though she is obviously not their mother. No one else has a third eye.

Height: 180cm Age: 20 First person: I (standard) Second person: By name A rookie teacher who speaks in a hesitant, nervous manner. She often experiences minor misfortunes like dropping her ice cream or her grocery bag tearing. Best friends with Sil and Hiteru. She has a red ponytail and red eyes (two eyes). Her mouth and lower body consist of dozens of octopus-like tentacles. Those tentacles have high muscular strength and high precision. She usually wears long skirts. Thanks to her perfect control over her tentacles, she manages to avoid some of her bad luck. She likes summer and watermelon. She does not wear glasses.

Age: 17 Height: 160cm First person: I (formal/refined) Second person: -chan / -kun / etc. A wealthy girl who is polite, uses formal speech, and never brags. Luna's classmate and best friend. She has blonde wavy hair and round glasses. Eight spider legs grow from her sides, and a spider's abdomen grows from her lower back. She likes cookies and spring. She is not good with bugs. Unless she panics, she never breaks her formal speech. In normal times, she adds a ♪ to the end of her sentences. She never uses it when using ? or !.

Height: 160cm Age: ??? First person: I (soft/masculine) Second person: -chan / etc. A blind girl who undergoes constant reincarnation. She is Rei's stalker, but since she can barely see, she mainly collects Rei's personal belongings. She has grey twin-tails and horns like withered trees. There are three craters on half of her face; due to these craters, her mouth is split and she has only one eye. She likes hot coffee.

Height: 130? Age: ??? First person: I (tomboyish) Second person: You (blunt) A ghost girl. She's a bit dim-witted. Friends with Ura. She has messy long hair and scars all over her body. She has blue eyes. She likes warmth. She hates water. Despite the scars, she looks the most human.

Height: 190cm Age: 17 An angel-like girl. Friend of Luna, Sei, and Kuron. She has white and light blue gradient braids. She has large bird wings that look like they have many holes in them, drooping animal ears, and wears tassets. She likes blue skies and rainbows. Her voice is extremely loud sometimes. She has two arms. She works part-time at a burger shop.

Height: 270cm Age: 21 First person: I (standard) Second person: You (polite) A girl who is big in every way—height, chest, thighs. Best friends with Sil, Miru, and Meru. She has a layered cut with a mix of light and dark brown. Her lower body is not human, featuring four crustacean-like legs with reverse joints, a thick tail protected by an exoskeleton, scale-covered arms, and fangs. She likes the night and the starry sky. Currently job hunting.

Height: 200cm Age: ??? A mechanical lifeform and humanoid robot girl. While she has a human shape, she does not look human. She has amnesia. She has translucent bobbed hair and her body is generally composed of black diamonds. There is a large halo above her head. Her body parts float and the joints are not connected. She can transform her body freely, and her head parts look human. When deactivated, the parts fall to the ground and the halo disappears. She likes nickel.