"Midori Days" is a Japanese manga series created by Kazurou Inoue. It follows the story of Seiji Sawamura, a high school student known for his tough demeanor and fighting skills. One day, he wakes up to find that his right hand has transformed into a miniature version of Midori Kasugano, a shy girl who has secretly admired him. The series explores their unique relationship as they navigate daily life together. Midori, now attached to Seiji's hand, helps him with various challenges, while Seiji learns to understand and appreciate her feelings. The manga combines elements of romance, comedy, and fantasy.