Chika Amatori/Relationships

Rinji Amatori
Chika's older brother and one of her main motivators to becoming an A-rank. Her brother and a close friend were both abducted by Neighbors. Chika's aim is to visit Neighbor worlds to search for her brother and friend. He asked Osamu to protect her if anything ever happened.

Osamu Mikumo
Osamu was tutored by and friends with her older brother, Rinji. She seems to respect him very much. His main motivation for joining border was to protect Chika for her brother. He was the only person she trusted after her brother's disappearance and before she joined Border. He is always encouraging her, and they share a mutual trust.

Yūma Kuga
Chika and Yūma first met underneath the bridge where both were waiting for Osamu. He is the first person besides Osamu that Chika opens up to and asks for help. She initially thought she was older than him because of his appearance. He was the first person to realize Chika's potential when assessing her Trion level, and Chika was the one who taught Yūma how to ride a bike.

Reiji Kizaki
Chika's mentor. Although slightly intimidated by him, particularly at first, Chika admires Reiji and does her best to prove herself a worthy student. Reiji sees much potential in Chika and is fond of her.

Yūichi Jin
Unlike with Osamu and Yūma, Chika is rather shy around Jin. They have a good relationship nonetheless.

Shiori Usami
Shiori often spends time with Chika while not on duty at the base, they have a strong friendship. Usami supports Chika extensively in battle and in quite protective of her.

Izuho Natsume
A fellow Sniper and friend of Chika's. They first meet during Sniper Training in the Enlistment Day. Although they have a rough start when they were introduced to each another, as Chika got a better ranking in training and Izuho assumes she is rubbing it on her, they quickly become good friends.

Akane Hiura
As they're both Snipers, they meet in the Sniper Training after their ranked war. They seem to get along well, and to have a friendly rivalry. They both promise to have a rematch between their teams.

Aoba Harukawa
Chika's childhood friend who disappeared, and suspected of being taken by neighbors.

Yuzuru Ema
Like with Akane, they meet in the Sniper Training. He seems to have a crush on her, and even talks about his mentor to her. Chika lets slip to him that she is unable to shoot people.

Isami Tōma
Chika meets him in Sniper training, along with Yuzuru and Akane. They have a friendly relationship.