都心部から少し離れた街にある美術系学校、有杜学園。 入学から２年が経ち、一学年先輩の「桜田杏」 幼馴染の美人姉妹「三枝アヤメ」「三枝ヒナタ」 ギャルな後輩の「葛城七瀬」やよく遊びに来る「 木暮郁枝」「漆原莉子」 と共に充実した作業部屋を中心とした 学生ライフを送っていた。 時が過ぎ、杏先輩の卒業と入れ違いに新入生の「ローラ」「真庭花梨」が入学して 『妹系な後輩達から溺愛されまくる』学園生活が始まった！

The protagonist, Ikenaga Ren returns after several years away from his hometown, returns to enroll in the Private Arimori Academy, an art school. On the first day of school, he unexpectedly reunites with the two of his childhood friends with whom he used to paint illustrations in the past, twin Saegusa sisters Hinata and Ayame. While surprised and confused by how they have grown, he takes his time to return their relationship to how it has been in the past. Furthermore, he meets a third year Kanno Junko who has a very strange theme running for her art, and a second year Sakurada An who is interested in stage design and subculture. Meeting these two makes his daily life speed up even more. This is the story of how "like" turns into "love"...