Daikirai na Unmei no Hito

Nanoha Kido works as a programmer in an IT company... and has a powerful enemy. That enemy's name is Mr. Haba! He's a boss who always has a cold and calculated expression, impossible to read, and is constantly putting more and more work on her desk. After getting through some extra work Mr. Haba left for her, Kido comes across the old live venue she would go to. At the show there, she finds the band she was a fan of for the longest time, with some unexpected people alongside them...! (Source: MangaPlaza)