Miki Ichinose (Mirai Shida) is the girl next door. She is an average junior high school second grader,who likes spending time with her friends and prefers extra curricular activities to studying. She also enjoys dating her year-older boyfriend, Satoshi Kirino (Haruma Miura).Her teenager life, however, becomes no longer typical when she gets pregnant and decides to keep the baby.

Everybody objects her decision to become a mother at such a young age.Her family and relatives worry about what others will say. Her teachers and classmates are only concerned with their school's reputation. Even Satoshi refuses to accept his future role as a father. Miki feels that nobody is on her side, and almost decides to give up the baby. But she suddenly realizes and says to herself: "Everyone is against me except for one person, the one who is inside me;my baby!"

Miki finally decides to keep the baby, and flees home to find a place to give birth peacefully. Her journey is, of course, full of hurdles: People,when finding out about her situation, begin pointing fingers. And some even become abusive towards her. Still, as in every journey, goodhearted people are always there to help. In such a harsh situation, Miki never loses her cheerful and positive attitude, because she already knows she will never be alone again. As Miki begins to show, she also matures mentally by rousing maternal instincts, attaining strength and tenderness as a future mother.

Following a girl's coming-of-age story, in front of our eyes unfolds a human drama exploring the various faces of love.

一个平凡而普通的中学二年级女生，怀上了中学三年级男友的孩子。面临周遭的强烈反对，她没有放弃，决心将孩子生下来。在这艰难的抉择中，这个十四岁的女孩在精神上渐渐成长为一位坚强而勇敢的母亲。本剧正是讲述了这样一个关于「生命」的动人情感的故事。

并不擅长学习的一野濑未希（志田未来饰），喜欢跟朋友们一同参加社团活动，是个天真烂漫的中学二年级学生。但是，当她怀孕时，周围看待她的目光都发生了改变。她一心想要做母亲的想法遭到了家人、老师、朋友的反对。甚至连她的男友，即将成为孩子父亲的桐野智志(三浦春马饰)也选择了逃避。未希孤立无援。

但是，未希并没有因此而变得消极，她依然保持着乐观向前，用一颗十四岁的心灵竭尽全力去思考，最终决意将孩子生下来。因为未希察觉到，世界上只有一个人是支持她的，那就是孕育在自己体内的，任何都不可取代的婴儿的存在。「和我在一起的，有这个孩子！」

在艰难的时刻，未希所发现的不是绝望，而是通向明天的期冀。