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

6 girls and boys create a group called 'Super Piece Buster'. They were unseparated until one of them, Honma "Menma" Meiko passed away and separated her 5 friends.

10 years later, Menma appears in front of her now grownup friend Yadomi "Jintan" Jinta. Menma asks Jintan to fulfill a wish that she can’t remember to move on to the next life. That’s where you come in.

The PSP game has a branching story and multiple endings made just for the game. On top of the visual novel component, this game has a communication mini-game where you can talk to a 3D model of Menma everyday.

[edited from SiliconEra]