Zutto Mae kara Suki deshita.

At Sakuragaoka High School, Zutto Mae kara Suki deshita.: Kokuhaku Jikkou Iinkai follows Natsuki Enomoto, who finally works up the courage to confess to her childhood friend Yuu Setoguchi. In the rush of embarrassment, she blurts out that it is only a "practice confession," leaving Yuu unaware of the truth behind her feelings. Still, he chooses to stand by her and promises to help her find love, even as both of them struggle with emotions they can barely express aloud. While Natsuki deals with the sting of her failed confession, her classmate Koyuki Ayase realizes that he has fallen for her as well. Shy and hesitant, Koyuki decides to pursue her despite his own lack of confidence, setting off a quiet triangle of affection and uncertainty. Around them, their close friends become entangled in other one-sided loves and unspoken attachments, turning ordinary school days into a web of awkward encounters, missed chances, and confessions waiting to be made.