Ринтаро Цуда

Rintarou Tsuda is the hero of Kimi ga Shinu Made Ato 100-nichi (100 Days Until You Die). He is a very emotional boy that has been able to see living things' lifespans counting down from 100 since he was a child. He cares very deeply for Umi and has been looking out for her ever since they were kids.