Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.  

あの日見た花の名前を僕達はまだ知らない。

The story revolves around Jinta Yadomi and his childhood friends who have drifted apart due to a tragic accident. Now in high school, they are forced to face their guilt over the incident and find closure for their past.