Determined to reform the Little Busters, Riki attempts to invite Masato, who refuses, claiming that what only matters to him is to "become the strongest". Soon after, Riki and Rin hear news of Masato attacking other students and devise a trap to stop him. However, the trap fails to restrain him fully and he starts pursuing them. After setting another trap with Rin's help, Riki manages to wear down Masato to the point of being able to defeat him barehanded. The knocked down Masato then reminisces that before meeting Kyousuke, he used to be treated as a fool by his peers until he trained his body enough to beat down whoever insulted him. This resulted in him becoming isolated because of it, until Kyousuke appeared and defeated him by also using traps, leading to them becoming friends. Masato began his rampage at school because he suddenly started seeing everyone else as a copy of himself and believed that he could only distinguish himself from the others by becoming the strongest of them all. After renewing his friendship with Masato, Riki realizes that he must eventually confront Kyousuke as well for his and his friends' sake, while a serious Kengo watches over him from afar.