"I just want to live my life!" Said Haruna Kou, a girl who wakes up without memory nor knowledge of her surroundings in Tokyo, Japan. She meets teenager Touma Mabuchi, and starts living with him.When asked of what she truly wants, Haruna replies those very words— that she just wants to live her life; without a care to who she was.But upon the eve of the Sumida Fireworks Festival, her past begins to unfold before her own eyes.