One

The Sakurai sisters have been on their own since they were young. Annya was only fifteen when she started raising her little sister Ichika. For as long as Ichika remembers, it's been just the two of them.
Ichika has grown up dreaming of being a pro hero, just like their parents were until they died when she was two. Finally she's able to take major steps toward that goal as she is accepted into Japan's best hero school: UA.
With the support of her older sister, Ichika works her way through the trials of UA and deals with the drama that comes with being a teenager with superpowers.