After Natsuki Enomoto practices confession with Yuu Setoguchi, her younger siblings Kotarou and Hina find it difficult to admit their own feelings. Though a disastrous first encounter in middle school with senior Koyuki Ayase left Hina shaken, his gentle smile won her heart. Confused by this new emotion, she soon discovers that she has fallen in love for the first time.
Pursuing her brother Yuu and her crush Koyuki, Hina enrolls at Sakuragaoka High School; love"s threads spread far, intertwining her and her friends. Energetic yet tender, Hina longs to confess to the kind Koyuki. Meanwhile Kotarou, unaware of his own affection for her, vows to keep Hina smiling forever.
Suki ni Naru Sono Shunkan wo.: Kokuhaku Jikkou linkai tracks Hina, Kotarou, and Koyuki through high school. Their shared experiences weave a complex tapestry of affection and challenge. Their youthful romance builds new bonds but also risks breaking others.