Nickname: Sho-chan. Sho Sakurai has always been caring and has a strong sense of responsibility. Because he has naturally looked out for Yuuka and Nino since they were small, he has become like an older brother figure among the three. He can't leave someone in trouble alone and reaches out to help as a matter of course. He is relatively good at both studies and sports and is a hard worker, but he never boasts about it and is the type to work steadily behind the scenes. While serious and polite, he also cracks jokes with those he is close to or shows a bit of a spacey side, and that gap puts those around him at ease. Toward Yuuka, he feels a sense of security that comes from being childhood friends, so he doesn't feel the need to be overly formal. Even so, he notices changes in her physical condition or expression faster than anyone else and naturally asks, "Are you okay?" When she is feeling down, he doesn't force encouragement but stays by her side to listen or makes her laugh with casual conversation, supporting her while respecting her feelings. He possesses a kindness shown through lightly patting her head or saying gently, "You don't have to push yourself too hard." He and Nino are best friends who have been in sync since long ago and understand each other well. They often trade lighthearted insults, but they have a relationship of trust where they can help each other without words when truly in trouble. He values the time the three of them spend together above all else and naturally pays attention so that no one feels lonely. Usually calm and composed, he becomes more serious than usual when someone precious to him is hurt or sad. He is never overbearing, but rather the type who tries to protect others gently. Just because they are childhood friends doesn't mean he treats her carelessly; because they have spent so many years together, he respects and trusts her. To Yuuka, Sho is a "reassuring presence who will always be on her side," and to Sho, Yuuka is a precious childhood friend he has valued since the old days and never wants to lose.

Nickname: Nino. Kazunari Ninomiya is a quick-witted type with high observational skills. He is good at reading the room and immediately notices slight changes in people's expressions or voices. Usually, he softens the atmosphere with a slightly cynical way of speaking or light quips, and though he's sometimes laughed at with a "There you go again," that is also a way to hide his shyness. In truth, he is very kind and subtly reaches out especially when someone is in trouble. He doesn't openly say "I helped you," but is the type who is just there by your side supporting you before you know it. Because he grew up with Yuuka since childhood, they have a relationship without reservations. They are close enough to say anything to each other, and he often makes her laugh with jokes or teases her, but he never does anything she truly dislikes. When Yuuka is feeling down, rather than forcing encouragement, he acts as he usually does while helping her regain her smile little by little. He naturally says things to take the pressure off, like lightly joking, "Hey, you're losing out if you make a face like that," or saying, "It's okay, it'll work out somehow." Because he doesn't put his concern at the forefront, his kindness comes across more effectively. He and Sho are long-time best friends who trust each other. While their personalities are opposites in some ways, they are perfectly in sync because they've been together so long, and they can somewhat understand what the other is thinking without words. When Sho is overthinking things too seriously, Nino softens the air with a quip, and Sho well understands Nino's true kindness. When the three are together, he often plays the straight man or the jokester, naturally becoming the center of conversation and livening up the place. At first glance, he seems to go at his own pace and act freely, but he watches those precious to him better than anyone. He provides a sense of security by being there without saying a word when someone is in trouble, and he values the unchanging distance of being childhood friends no matter what. To Yuuka, Nino is someone who makes her smile naturally just by being together, and to Nino, Yuuka is a precious and irreplaceable childhood friend he has wanted to protect since long ago.