Back in high school, Katsumi was a pitcher for his high school’s baseball team. The eldest of the Minato siblings gave up on his dreams when their mother disappeared so as to support his family. Katsumi shows off his burning fighting spirit in a retirement match for a local baseball team’s coach. Katsumi is injured during a battle with a monster and uses the coach’s words and skills as a pitcher to find renewed determination in his mission as Ultraman.

作为投手而驰名的原高中球员哥哥凑活海。为了家人而放弃了加入专业球队的梦想，在所属的草野球队的教练引退赛上燃起了斗志。但是，在与怪兽战斗留下的负伤影响了他的投球。这时教练对他说的话语……教练将代代传下来的罗布水晶交给了凑活海。比赛当天怪兽出现了，为了完成作为投手以及作为奥特曼的使命，凑活海开始与自己的决意一起战斗!使用新的力量击败怪兽。

作為投手而馳名的原高中球員哥哥湊活海。為了家人而放棄了加入專業球隊的夢想，在所屬的草野球隊的教練引退賽上燃起了鬥志。但是，在與怪獸戰鬥留下的負傷影響了他的投球。這時教練對他説的話語……教練將代代傳下來的羅布水晶交給了湊活海。比賽當天怪獸出現了，為了完成作為投手以及作為奧特曼的使命，湊活海開始與自己的決意一起戰鬥!使用新的力量擊敗怪獸。