Jack-In-The-Box is the seventh chapter of the Uzumaki manga and is a part of the second volume.
Summary[]
A boy named Mitsuru Yamaguchi at Kirie's school. He is in the 7th grade, and has the nickname Jack-In-The-Box because he "Loved to jump out and surprise people" He has a crush on Kirie, and tried to scare her, and asked her out while doing it. Mitsuru eventually died by trying to stop a car with his love for Kirie.