Mister Giants Eikou no Sebangou 3

ミスター・ジャイアンツ 栄光の背番号３

This is a documentary-style animated special drama that tells the story of Shigeo Nagashima, a representative postwar baseball player who was also known as "Mr. Giants" when he was still playing for the Yomiuri Giants. The story is just after the end of the war.