Hana-chan is a well-behaved girl who always gets good grades. However, she secretly has a strong interest in sexual things... One day, her older brother suddenly shows up at her room and shows her an erotic video, making her feel aroused. Realizing that his sister is curious about such things, he decides to take advantage of her by pushing his advances! As Hana-chan gives in to her curiosity, she tries her best to satisfy the desires of these young men around her.

はなちゃんは優等生タイプの大人しい女の子。だけど彼女も年頃で実はエッチな事に興味津々…。ある日、突然部屋にやって来た兄にエロ動画を見せられ、なんだかムラムラしてしまう。頭の中にエロい事しかない兄は、そんな彼女の様子に気付いて下心丸出しで迫ってきた！エッチへの好奇心が勝っちゃうムッツリスケベなはなちゃんが、年頃男子たちのエロい欲求を一生懸命受止める！