Yuri Kashiwaga was once known as a genius pianist. One day, she returns to her hometown in Goto Islands from Tokyo. There, she begins to work as a temporary teacher at a middle school and advisor for the school chorus. The chorus aims to take part at a competition. Yuri gives the members of the chorus members an assignment. She instructs them to write a letter with the title of “To myself 15 years later.” The 15-year-old boys and girls write about their secrets and worries.

Tamiko used to be a very good ping pong player as a child, but she is now twenty-eight years old and left the sport behind. Her mother Hanako had taught her how to play imposing discipline and regimen, but following the former's death the daughter had felt free by quitting the sport and instead leading an ordinary life. One of her co-workers Akihiko asks her to go steady one day, but soon sleeps with a pretty co-worker called Airi. Having lost her chance with this man she quits her job and returns to her hometown. Here her mother once owned a ping pong club. At the same time, the man she lost has joined the company's ping pong club prompting her to want to beat him. She begins to practice again.

A young girl tries to maintain a long-distance relationship with an aspiring fisherman.

某公司丢失了一枚存有商业机密的SD卡片，一时间办公室内吵吵嚷嚷，而临时工隐馆厄介（冈田将生 饰）首当其冲受到怀疑。厄介人如其名，从小就遭遇了无数令人匪夷所思的厄运，甚至连陨石坠落这种小概率事件他也没能躲过，当然厄运也让他的学业和事业饱经挫折。为了证明清白，他通过神秘的侦探事务所管理人绊井法郎（及川光博 饰）联系到了奇怪的侦探掟上今日子（新垣结衣 饰）。今日子留着银色的头发，浑身上下记满笔记。她只接受当日预约，所有案件保证当天解决，更为奇怪的是据说她睡了一觉后记忆就会自动清零。在今日子的帮助下，厄介成功洗刷清白，而他对这个与众不同的女孩隐隐有了好感，当然他们的羁绊绝不会就此终结…… 本片根据西尾维新的“忘却侦探系列”改编。