Ikigai - A Reason For Being.

Mizuno Koharu, A high school girl who lived alone in an apartment, doesn't have any interest to have any romantic relationship with any guy, love being kind to everybody, has an IQ of 140 but still called herself an average human being.

One day, she never knew what is coming for her. Everything change, completely.
But sometimes life can be harsh too, not every of her daily life that she went through was easy for her.