Yaji and Me

STORY

Yajiro is a child with intellectual disabilities, and his older brother, Taro, conducts research to enhance animal intelligence. One day, Yajiro lets Taro's experimental rat escape and names it Yaji. Soon, Yajiro and Yaji become friends. While enjoying its newfound freedom, the rat dramatically increases its intelligence. It reads several chemistry books and uses the knowledge it gains to create an explosive.