新井淑则(加藤成亮 饰)一直希望能够成为一名传道受业解惑的老师。从小被电视剧里的热血教师的形象所影响,新井发誓自己也要成为那样闪烁着耀眼光芒,为学生们指引正确道路的灯塔一样的存在。成人后,新井如愿进入了中学成为了一名国文老师,不仅如此,他还和深爱着的女友(泽尻英龙华 饰)结了婚组成了家庭。妻子为他生下了三个可爱的孩子,一时之间,新井事业家庭双丰收,成为了旁人羡慕的对象。 然而某一天,噩梦突然降临到了这个家庭的头上。新井失明了。这也就意味着,他的后半生要在黑暗和孤独之中度过。这突如其来的打击让这个家庭迅速来到了岌岌可危的边界。Young middle school teacher Yoshinori Arai is diagnosed with retinal detachment, losing the sight in his right eye first, then his left one as well, leaving him no choice but to take leave from the school. Arai's devoted wife, Mayumi, supported him through his moments of utter despair. She collected information about visually impaired people who were actively involved in various fields and found out about a blind teacher working at a regular school. Together they begin a battle in order to achieve his dream of returning to school once again, even with a guide dog at his side.