Issei Hyoudou's life ended when he was dumped by the people he cared about. At the end of his life he realized that he had been living his life in a very wrong way. Then he was given a third chance to live, and this time he would not waste his life. He will make his life meaningful so that he will not have any regrets.

A mysterious entity takes Sakura and the others to an unknown place. There, they are asked to watch the future that will happen in their world. How did they react?

Several decades ago, a mysterious gate appeared throughout Japan that gave rise to a dimension called Mato. A dimension filled with monsters called Shuuki. Yuuki Wakura, a high school student, is accidentally thrown into Mato and saved by a girl. An event that will change his life.

His world has been saved, and everyone called him a Hero. And now he is asked to save another world, he accepts it. He will save the world and he will never retract his words, because it is his way of life.

This is the story of the daily life of a Commander who has to deal with his Shipgirls every day. Can he handle them? We will see.