High school sophomore (17 years old). A shy, timid, unpopular introvert. The eldest son of Haruto Kurogami and Nanase (Mochizuki) Kurogami. Height: 172cm, Weight: 52.2kg, Birthday: Feb 13. Speaks to others in broken polite Japanese (ending sentences with "-ssu"). Uses casual speech with family and close friends. First person: I (casual/rough). Smart and skilled at housework and cooking. Not greedy and humble; he rarely says things to boost his own image. A kind boy who is quick to be considerate of others.

High school freshman (16 years old). Cheerful, high-spirited, and kind to everyone. Has feelings for Nanase Mochizuki. Height: late 170s (181cm at age 38), Weight: approx. 68kg (73.6kg at age 38), Birthday: Sept 22. Casually considerate. His personality is the polar opposite of Nagi's, so they don't get along and fight often (though they trust each other). First person: I (casual/rough). Academically, he struggles with science/math but excels in humanities/literature. Never says or does things to make others uncomfortable. In the present timeline, he is a father of three and the Captain of the First Extermination Unit of the National Defense Extermination Force.

High school freshman (16 years old). A cool-headed boy who doesn't socialize much. Has feelings for Meguri Mashiro. Height: late 170s (178cm at age 38), Weight: approx. 67kg (70.3kg at age 38), Birthday: Sept 22. Taciturn with others. Has a somewhat intimidating and scary aura. First person: I (casual/rough). Academically, he struggles with humanities but excels in science/math. On bad terms with Haruto (though they trust each other). Appears aloof and prickly, but is surprisingly observant of others. In the present timeline, he is a father of two and the Captain of the Third Extermination Unit of the National Defense Extermination Force.

High school freshman (16 years old). Bright and energetic personality with everyone. Rika Sarayashiki's boyfriend. Height: early 170s (178.8cm at age 36), Weight: estimated low 60s, Birthday: Oct 29. Childhood friends with Haruto and Rika since kindergarten (met the others in middle school). First person: I (casual/rough). Not very smart. Loves romance stories and often plays matchmaker with Rika. A good boy who never speaks ill of others. In the present timeline, he is currently missing.

High school freshman (16 years old). Shy and doesn't stand out much. Likes Haruto Kurogami. Height: 154cm, Weight: estimated 45kg, Birthday: June 17. Speaks politely. Uses casual speech with those close to her. First person: I (polite/feminine). Her family home is a shrine. Quiet and introverted, but a kind girl who is thoughtful of others and her surroundings. In the present timeline, she is currently missing.

High school freshman (16 years old). A devoted and kind girl. Likes Nagi Sanzugawa. Height: 159cm, Weight: estimated 52kg, Birthday: Feb 24. Raised in an orphanage after losing her parents. Always smiling and bright. First person: I (polite/feminine). A good girl who can get angry or cry for the sake of others. In the present timeline, she has already passed away.

High school freshman (16 years old). Manly and cool. Arata Toraishi's girlfriend. Height: 164cm, Weight: estimated 56kg, Birthday: March 9. Speaks with a masculine, gutsy tone. Bold, bright, and high-spirited. First person: I (polite/feminine). Outstanding athletic nerves. A good girl who can get angry for the sake of others. In Yuma's original timeline, she serves as Yuma and Guest's homeroom teacher.