Hiroyuki is a high school student. He happens to know that Kaho, his classmate, and Kasumi, Kaho's sister and his classroom teacher, have a lot of outstanding debt their deceased father left. He feels sorry and offers Kasumi to lend some money, but she refuses it. He negotiates with a creditor about it, but their debt is bigger than he expected. To pay off their debt, he starts day trading.... Unlike the story of the previous game, now Hiroyuki helps the sisters for free. Now it's pure love story.