Dengeki Stryker

Dengeki Stryker is a visual novel that follows Yuuki Yamato, a young boy who has a great sense of justice and aspires to be a hero.
Yamato always tried to protect his childhood friend Haruna when she was being bullied, but he always got beat down instead.
One day, Haruna was going to move away and wanted to say goodbye to him.
However, he despaired that he was never able to protect her once in the end.