Chitose Amano is a character who appears at a cosplay event held in an aquarium. He is a twenty-year-old university student who participates in cosplay under the name Amane Himeno. While his presentation and mannerisms are entirely feminine when he is in costume, Chitose is biologically male. His cosplay is so convincing that he is often mistaken for a woman by other attendees, and he is highly skilled at using makeup to hide masculine features such as beard stubble.

In his daily life, Chitose has a slim build and is slightly shorter than many of the female characters in the story. He is described as a strikingly handsome young man with an androgynous charm, to the point that even other characters are surprised by his good looks when they see him without his cosplay. His natural speaking voice is masculine, though he is able to adopt a feminine tone while in character as Amane Himeno.

Chitose has a warm, straightforward, and kind-hearted personality. He is known for being direct and unafraid to speak his mind, which can be surprising given his delicate appearance. He is also remarkably bold and confident, showing no embarrassment about his hobby or his body, to the point of changing clothes in front of others without hesitation. Despite this outward confidence, he is gentle and supportive toward other cosplayers, especially those who are new to the community. He is observant and thoughtful, paying attention to the dynamics between people and making an effort to understand their true feelings.

Chitose began his journey into cross-dressing during his second year of high school. His sister encouraged him to try it after seeing male comedians dress as women on a broadcast, suggesting it looked like fun. Prior to this, he had disliked his own appearance for not being masculine enough, but cross-dressing allowed him to become someone else and gradually helped him build self-confidence. His mother and sister supported him, teaching him makeup techniques and encouraging his interest. Unlike some cosplayers who come from otaku hobbies, Chitose developed his cross-dressing hobby first and later expanded into cosplay, so his knowledge of subculture and otaku slang is somewhat limited.

A significant turning point in his life came when he began dating a girl after entering university. When she discovered his interest in cross-dressing cosplay, she accused him of cheating and demanded he throw away his costumes, calling the hobby disgusting. Unwilling to give up an activity that had helped him accept himself, Chitose chose his passion for cosplay over the relationship and ended things with her. This experience, while painful, reinforced his commitment to being true to himself. He remains cautious about potential negative reactions from others and always informs people who want to take his photograph that he is male, though he has generally found that most respond without prejudice.

Chitose first appears in the story at an aquarium cosplay event, where he encounters the protagonists Wakana Gojo and Marin Kitagawa. He is in costume as Subaru Hatsusegawa, a character from the fictional idol game Space Idol Cosmo Lovers, when the hook on his skirt breaks. Gojo and Kitagawa come to his aid, fixing the problem and beginning a friendship. Chitose is initially wary of them, but after learning that Gojo makes costumes and that Kitagawa is a beginner cosplayer, he opens up and shares his knowledge, particularly about cross-dressing makeup techniques and recommended shops. He later shares his personal history with them, including the story of his ex-girlfriend, and finds acceptance and healing in their supportive response. Marin is moved to tears by his story, while Gojo reassures him that his hobby is not strange.

Chitose becomes an important supporting figure for both protagonists. He provides valuable mentorship to Marin, helping her improve her makeup skills and navigate the cosplay world. He also appreciates Gojo dedication to costume-making, even though Chitose himself takes a different approach. Unlike Gojo, who makes all his costumes from scratch, Chitose prefers to purchase ready-made costumes and wigs, focusing his efforts on perfecting his makeup, presentation, and character mannerisms. His skills in self-presentation are highly admired by others in the cosplay community.

Throughout the story, Chitose continues to appear at various cosplay events. He participates in a group cosplay for the horror game Coffin, taking on a character named Emma. He also becomes friends with other cosplayers such as Suzuka Ito, Akira Ogata, and Miyako Honda. He demonstrates his observant nature when he notices that Akira seems uncomfortable around Marin and takes the initiative to speak with her privately, though it turns out Akira is actually a shy fan rather than someone who dislikes Marin.

Chitose is protective of his friends and their shared hobby. When an editor contacts him with an offer for a gravure photoshoot after mistaking him for another cosplayer, he refuses and blocks the contact. Later, when the same editor finds Marin and attempts to contact her for professional work, Chitose proactively blocks the editor on social media, restricts direct messages and replies, and deletes all photos of Marin from his accounts to prevent any unwanted approaches. He considers cosplay strictly a hobby, not a career path, regardless of gender.

Chitose passion for cosplay is deeply tied to his personal growth and self-acceptance. He found a way to overcome his insecurities about his appearance by becoming someone else through costume and makeup, and over time, this helped him learn to like himself. He is open about his identity and refuses to hide or apologize for who he is, having chosen his true self over a relationship that could not accept him. He wishes for others, particularly Gojo and Marin, to continue enjoying cosplay together and supports them in their own journeys.