Haruki Shiga

Haruki Shiga (志 (し) 賀 (が) 春 (はる) 樹 (き) , Shiga Haruki), or "Me" (「僕 (ぼく) 」, "Boku") as he's addressed before the story's end, is the protagonist of the I Want to Eat Your Pancreas series and the first person to discover Sakura Yamauchi's secret. He is Fuyumi Shiga's father in a sequel novel of the story.