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

Synopsis

Jinta "Jintan" Yadomi is being pestered by a girl named Meiko "Menma" Honma, who only he can see. Menma says she has a wish she wants him to fulfill, but she can't remember what it was. Soon, she recalls that the dream was to have their friends all together again. One of the former friends, Naruko "Anaru" Anjou, drops by Jinta's house to drop off some homework, but is on bad terms with him. It is revealed that Jintan has poor school attendance. As Menma pesters Jinta to go after Naruko and talk to her, they both go into the city where they run into two other former friends, Chiriko "Tsuruko" Tsurumi and Atsumu "Yukiatsu" Matsuyuki, the latter of which reacts harshly when Jinta accidentally drops Menma's name. Frustrated, Jintan runs off and leaves Menma behind. Jinta begins to recall the past when he, Menma, and their other friends were part of a group known as the Super Peace Busters that hung out together when they were children. One day, Jinta accidentally hurt Meiko's feelings when asked if he liked her. He decided to apologize, but she died in an accident before he could. Back in the present, Menma visits her family's house. Jinta decides to search for Menma so he could finally apologize and he checks out their old secret fort. Here, he runs into the last of the six old friends, Tetsudou "Poppo" Hisakawa. (Source: Wikipedia)