At Sakuragaoka High School, love stirs as Natsuki Enomoto gathers her courage to confess to her childhood friend, Yuu Setoguchi. However, her confession takes an unexpected turn when she labels it a 'practice confession' out of embarrassment. Oblivious to her true feelings, Yuu vows to support Natsuki in her pursuit of love. Amid Natsuki's turmoil over her failed confession, classmate Koyuki Ayase harbors his own affection for her, determined to capture her heart despite his shyness. Zutto Mae Kara Suki deshita.: Kokuhaku Jikkou Iinkai delves into Natsuki's aspirations to break free from mere practice confessions and express her love genuinely to Yuu. As their intertwined stories unfold, other friends grapple with their own hidden emotions and unspoken desires.