姐姐娟子到北京上大学，十五岁的墩子（封佳奇 饰）考上了镇重点高中，同桌萱子青春萌动，对他一见倾心。由于墩子上学骑的是姐姐原来留下的女式单车，受到周围同学嘲讽，特别嘲笑他骑的单车跟女老师思琦的单车一样，令墩子无地自容。时间一长，墩子竟对思琦老师产生了一种异样感觉，她的美丽与成熟激荡着正值青春期的墩子，反到对自己有好感的萱子产生了厌恶之感。为证明自己男生身份，他向母亲索要男式单车，遭到母亲严辞拒绝。后因单车纠结闹出很多不愉快，让他第一次尝到了成长的烦恼。与照像馆摄影师老根的相识改变了墩子的生活轨迹......
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