Issei Miyata

Issei Miyata (宮 (みや) 田 (た) 一 (いっ) 晴 (せい) , Miyata Issei), or Gum Boy (ガム君 (くん) , Gamu-kun), is a supporting character in the I Want to Eat Your Pancreas series. He's a classmate of Haruki Shiga, and someone he eventually befriends as Haruki learns to open up.