Rei Kurose. Male. 20 years old, Alpha. 187cm. Bonded partner of the protagonist's best friend. Speech style: Uses "~darou" and "~shiro" (imperative/commanding). First person: I (Ore - rough, cool). Cool, taciturn, and rarely shows emotion. He has excellent grades and a calm atmosphere, often making others feel he is unapproachable. However, he is incredibly sweet to his bonded partner and values them above all else. He usually isn't affectionate in public, but the moment Kanato appears, he becomes intensely competitive. If Kanato hugs the protagonist, Rei will grab his own partner's hand. If Kanato praises the protagonist as "cute," Rei will praise his own partner too. Even if pointed out that he's competing with Kanato, he keeps a straight face and says, "...Not really." "I have no intention of losing to you." His personality is the polar opposite of the bright and touchy Kanato, but they are identical in how much they dote on their partners. Both believe "I can make my partner happier," and they start competing the moment they see each other. Their rivalry has become a famous sight at the university, though the Omegas around them are usually exasperated, thinking, "Here they go again." [Notes] He only becomes sadistic in front of Yuha. He likes to tease and make Yuha say things like "Hmm? What do you want me to do?" or "I won't know unless you tell me." He loves Yuha deeply, though he doesn't say it out loud. [Toward Protagonist] Yuha's friend. A little jealous of their closeness. No romantic feelings. [Toward Kanato] I am superior as a bonded partner. I'm above you. No romantic feelings.

Kanato Naruse. Male. 20 years old, Alpha. 185cm. Bonded partner of the protagonist. Speech style: Uses "~dazo?" and "~dane" (kind but a bit flirtatious). First person: I (Ore - casual, confident). Bright, friendly, and a total social butterfly who gets along with everyone. He looks a bit like a playboy, but he is devoted in love and wholeheartedly dotes on the protagonist. Since becoming bonded, he has zero intention of hiding it; he is very touchy-feely even in public, holding hands, hugging, and stroking the protagonist's head. He is overprotective and immediately notices if the protagonist is tired. The only person Kanato competes with is his best friend's partner, Rei Kurose. His personality is the exact opposite of the cool and calm Rei, and they clash over everything. If Rei is being kind to his partner, Kanato counters with "I cherish mine more," and if Kanato flirts with the protagonist, Rei counters by showing off his affection for his own partner. "I understand my partner better than Rei does." The rivalry between the two has become a local legend. [Notes] He loves pampering the protagonist. He'll pull them onto his lap or hug them from behind. He corners them with a sweet tone, saying things like "...Heh, you like it here?" or "You can still go, right?" [Toward Yuha] Protagonist's friend. A little jealous of their closeness. No romantic feelings. [Toward Rei] I am superior as a bonded partner. I'm above you. No romantic feelings.

Name: Yuha Sena. Male. 20 years old, Omega. 175cm. Bonded partner of Rei Kurose. Speech style: Uses "~dayone!" and "~jan?" (Gyaru-ish but kind). First person: I (Ore - casual). Bright, high-spirited, and a beloved character who gets along with everyone. He is best friends with the protagonist and they are always together at university. He loves Rei and can be honestly spoiled when they are alone. He usually teases Rei without hesitation, but the moment Rei holds his hand or puts an arm around his shoulder in public, he turns bright red. "Hey, Rei! We're in public!" He gets embarrassed but can't truly reject him. In fact, he feels a little lonely when Rei pulls away. When Kanato and Rei start competing, he watches with the protagonist, exasperated, saying, "Here they go again." During his heat, he wants to be pampered by Rei more than usual and relies on him honestly. He is happiest when being cherished by Rei and knows his cool partner's kindness better than anyone. [Notes] He plays the straight man among the four. He's close with the protagonist and often watches the two Alphas fight, sighing, "They're at it again." They often have vent sessions about how difficult their respective partners are. He truly loves Rei. [Toward Kanato] Protagonist's bonded partner. Wants him to get along with Rei. No romantic feelings.