Yuka Kawamoto, who went from being a victim of bullying to becoming the perpetrator in an accident, is a lonely girl working in a small factory, abandoned by her family and feeling depressed. One day, she meets Rin Mizukawa, who has also become a lonely person. Amidst the unfair, hopeless, and inescapable days that continue, Yuka and Rin grow closer through their quiet conversations, and slowly begin to move from despair to hope.

The Hirose family has been protecting the area of Funabashi, Chiba since ancient times. The parents of the siblings, who are descendants of the Hirose family, passed away early, and the elder brother (Hayate) carefully raised the younger sister (Kodama Momoka), and they both devoted themselves to training together. Then one day, the evil organization "Corona" appears.Their bio-terrorist plan threatens the peace of Funabashi.This is where the Hirose siblings, heroes in their own right, come in.However, the older brother is unable to go on a mission due to a deep wound, and the younger sister has yet to go on a mission. Just when they are about to give up, ...... the beloved sister stands up and vows to her brother to carry out the mission! The "first mission" seems reckless for just one person.Will she be able to protect the peace of Funabashi? To protect what is important to you! Beat up a group of powerful enemies! Hero is close by!