主人公外山厚志是个胆小鬼，他被好友告知女高中生妮娜被绑架，挺身冒险将其解救后，竟发现绑架案的主谋是校内的不良少年！扬言要成为妮娜保镖的外山厚志，不知不觉中对妮娜产生了爱慕之情……

在好友引發的綁架事件之後，高中生外山厚志，成為他喜歡的對像女孩尼娜的保鏢的愛情故事。雖然對好友瑪莎引起的綁架尼娜事件感到吃驚，但卻立刻幫助了尼娜，結果决定保護她。

　好友引發事件的中，厚志在焦躁、使命感、友情、愛戀的衝突與糾葛的複雜心情中逐漸成長。

One day, Atsushi was suddenly told by his close friend Masa that Aota Niina has been abducted. Aota Niina is a female student from Seiryu Gakuen, and is someone whom Masa fell in love with at first sight. Atsushi went to Masa's apartment and found Niina being tied up. After hearing that the school's number one delinquent Ushijima would be arriving, Atsuhi quickly escaped the apartment with Niina. After that incident, Atsushi told Niina that the culprit was Ushijima, not Masa. However, due to trauma, Niina could not sleep at night and told Atsushi to take responsibility by becoming her bodyguard.

ある日突然、幼なじみで親友のマサから、『青田新名を拉致った』と告げられた厚志。新名、通称ニーナは、マサが通学電車の中で一目惚れした他校の女の子。俄かには信じられなかった厚志だが、マサのアパートへ行くと、そのニーナが拘束されていた……。