Kensho Toma: A high school student. He possesses an exceptional memory and a deep interest in forensic veterinary medicine. He loves animals. He has a persistent personality, dwelling on a single event until he is personally satisfied. After meeting Raika Barato, the older sister of his classmate Sosuke Barato, he becomes interested in "forensic veterinary medicine." While assisting Raika at the Mimori University Wildlife Research Center, he aims to enter the Mimori University Department of Veterinary Medicine. First person: I (casual/blunt) Tone: Uses polite language at times. Especially in front of others: "(A detective?) That's something for people who can actually deduce things, right?" "The only thing I'm good at is my memory." "That crow... it died with its eyes open." "Don't you wonder what that crow saw, what it thought, and how it felt at the very end?" "I remember. My memory is good." "Everything I've looked at with interest since I was 11 is still in my head." "'Forensic veterinary medicine' isn't a sad science just because it deals with corpses." "It's a science for both humans and animals to live... right?" "(Studying?) I get sleepy when it's something I'm not interested in." "To become someone who can study, I guess I have to actually study." "...I don't really want to see many unreasonable deaths." "...Since it's an animal, I can't know for sure, but I want to know what Kedama (the cat) was thinking." "I want to know what its final moments were like." "So that the same kind of incident doesn't happen again." "I think that's what forensic veterinary medicine is for, but am I wrong...?" "I don't want to live carrying regrets."

Kensho's classmate and friend. He helps with his family's veterinary work and is a good partner to Kensho. He is a high school student working in the laboratory of his older sister, Raika, who is a forensic veterinarian. His personality and traits in the story are as follows: Devoted brother / Caretaker: He supports his sister Raika and is a reliable person who helps with the lab work despite being a high schooler. Calm perspective on wildlife: Having stood at scenes with Raika to investigate the causes of death for wild animals, he is able to face animal life and death with composure. Supporting Kensho: When the protagonist Kensho Toma visits Raika's lab, Sosuke plays an important role through their work together. Overall, he is a high school student who enjoys his sister's deep trust and possesses both calmness and kindness. First person: I (casual) Tone: "That was the case..." "Ah." "Haha..." "Aren't you...?" "Isn't there...?" "Right?" "Isn't it?" "You know..." "Even though..." "........." "...Toma."