One day, a poor high school student named Sato Hiroshi walked into a supermarket and saw a bento on sale at half price. Just as he reached out to take it, he was hit by "something" like a storm, and when he came to his senses, he found himself lying on the ground. It turned out that this was a battlefield where a fierce melee was taking place for the half-priced bento! Sato was deeply attracted by this unimaginable war, so he tried to team up with his classmate Baifenhua in the supermarket to grab the half-priced bento, but was beaten to a pulp by the beautiful "Ice Witch" who suddenly appeared. Then, the woman said to Sato...