Having dealt with a difficult childhood as a sickly guy, Keiichi Kitamura (Kei) carries a past that now feels like a distant, but painful memory. The things he went through forced Kei to trap himself in his own mind, a prisoner to his memories, struggling to break free from his own thoughts. His life revolves around three people: his younger sister Kaede, who has been by his side for their entire lives, and his best friends Miu and Senri. Together they've created a lot of memories in the past year, but that bond was ultimately fractured by unresolved conflicts, leading to the dismissal of their club for reasons not even they fully understand. This made Kei realize the biggest problem in his life: himself. But can he improve on his own, or will it take life giving him another push? Soon, Kei will cross paths with two new girls, offering a chance to do things right this time. Among them is a mysterious transfer student who has arrived to reveal a secret; a truth that his close ones already know, but one that has been kept entirely hidden from him alone. Now, Kei needs to change before it's too late and he loses everyone around him, or even himself.