Koyuki builds walls because the world feels safer that way, but Minato doesn't care how many she constructs, he's already inside them before she notices. The show knows the real romantic moment isn't the confession; it's the small, daily choice to let someone stay when letting them go would be easier. Four teenagers learning that isolation feels like safety until you realize it's just slow suffocation.

Koyuki Hikawa keeps a wall between herself and everyone else. To most students at her high school she looks unapproachable and even frightening, but in truth she is insecure and prone to overthinking after bad experiences in middle school. She spends her days mostly alone until she meets Minato Amamiya, a boy with no sense of boundaries who keeps trying to close the gap between them. Along with Minato, the kind basketball player Youta Hino and her popular friend Miki Azumi are unafraid to approach her and see who she really is. As Koyuki spends more time with the three of them, she feels pulled between this new happiness and her fear of getting too attached, while each of her friends privately deals with struggles of their own. Blending comedy, drama and romance, this slice of life story follows four confused young people as they slowly come out of their shells and start to enjoy their teenage years.