园田宏（野田洋次郎 饰）从小就梦想成为一名画家，然而，残酷的现实撞碎了他的艺术梦想，从美大毕业之后，园田成为了一名玻璃清洁工。让园田更加难过的是，曾经和自己一起为了梦想而奋斗的前女友如今已经成为了小有名气的画家，还举办了个人展览。 　　一天，园田忽然晕倒，不愿意将自己生病的事情告诉家人的他拜托偶然邂逅的女高中生真衣（杉咲花 饰）假扮成他的妹妹，陪他去医院做检查。让园田没有想到的是，他患上的是胃癌晚期，生命只剩下三个月左右了。在真衣的陪伴和鼓励之下，本来打算全盘放弃的园田决定入院接受治疗。Hiroshi is an art school graduate who abandoned his dream as an artist to work as a window cleaner. When he realizes he has only three months left in his life, he meets a high school student named Mai and once again finds passion in drawing.