Tomozo Kaoru

When a person who under goes extreme depression/anxiety, loses control, a person will become a demon consumed by darkness. Luckily there are those devoted to hunting those demons. Boy meets monster while taking shortcut home from school, is rescued by a girl with a gun. Monster gets away. Later on, girl makes contract with boy and uses his soul energy to make a big gun and kill the monster…

Toko is a shy, awkward girl who hates her summer holidays. They just don't seem to end, and she's right. She is stuck on August 31st. Every day's the same as any other August 31st, except when a new character comes and changes how her whole day goes, and what she learns later on is not what she wanted to know…