Member of the baseball team from a prestigious school known for their sporting prowess. However, he is only a sub member. He aims to become a professional player in the future but his skills are still sub-par and it will be a while before he makes the starting lineup. Drawn to his sincerity and tactless honesty, a Transient shepherd named David took a liking to him and possessed him. Though he himself lacks talent, he is well-liked by people who do have it which gives him opportunity to hone his skills and better himself. However, talented people cause him to feel inferior so he can’t help but rebel against their advice.

スポーツ名門校の野球部員。ただし二軍。将来はプロ野球選手になる事を目指しているが、野球の技術は拙く、レギュラー入りは遠い。グランドで先輩の玉拾いに明け暮れる日々である。真摯であるというよりも愚直であるという言葉が似合う男。羊の導き手たる「転光生」ダヴィドに気に入られ、半ば強引に憑りつかれてしまった。彼自身に才は無いが、才有る者に気に入られ、磨かれて光り輝く存在である。だが彼自身は、才有る者に対してその眩しさから、つい反発の念を抱きがち。

是體育名校的棒球社社員，不過是二軍。目標是當上職業棒球選手，但因為技術拙劣，離以正式選手身分出賽還有很長一段路。每天過著在球場上幫學長撿球的日子，與其說充滿熱誠，倒不如說是愚笨憨直。受到羊群引領者「轉光生」大衛的欣賞，被半強迫地附身。雖然沒有才能，卻能吸引有才能的人士，只要磨練就能散發光芒。但看到有才能的人散發出耀眼光芒，常讓他心生排斥。

体育名校的棒球部成员，不过是替补队员。目标成为职业棒球选手，但棒球技术拙劣，距离成为正式队员还很遥远，只能日复一日地在球场上帮学长们捡球。他的性格与其说是真挚，倒不如说是愚直。羊之指引者“转光生”大卫看中了他，半强制性地附体在他身上。他虽然碌碌无为，却被有才之人识中，历经磨练后光芒四射。但他本人在感受到有才之人的耀眼夺目时，会不禁想要挣脱。

Kyuma became the ultimate pitcher by yielding control of his body to a Transient named David, who had the greatest hurling arm across the worlds. He gained the ability to throw fastballs that would destroy giants as well as regulated curveballs that took advantage of each opponent’s weaknesses. Unsatisfied with borrowed strength, he began to train thrice as much as anyone else to become an incredible pitcher in his own right. As a result, David grew to like him even more and now joins Kyuma in training by the riverbank.

数多の異世界において最優の投手の一人である「転光生」ダヴィドに体の制御権を渡したキュウマは、巨人をもねじ伏せる剛球と、相手の弱点を貫く精緻な制球を備えた超高校級のピッチャーへと姿を変える。しかし彼は、それを良しとせず、あくまで自身の力で凄い投手になりたいと願い、他の人の三倍の特訓を続けるのだ。そしてダヴィドはそんな彼をますます気に入り、今日も河川敷での特訓に付き合うのであった。

球馬將身體的控制權，交給了在眾多異世界都是最佳投手的「轉光生」大衛後，化身為遠超高中水準的投手，不但可投出降伏巨人的速球，另外還具備能貫穿對手弱點的精密控球力。不過他並不為此感到滿意，仍期許以自己的力量成為一流投手，持續進行超出他人練習量三倍的特訓。大衛因此越加欣賞他，今天也在河濱陪他一起特訓。

“转光生”大卫是众多异世界中最优秀的投手之一，球马将身体的控制权交给了大卫，化身成为一名超越高中级的投手。球马不仅能投出制服巨人的快球，还掌握了可击穿对手弱点的精细控球技术。但他并没有因此满足，而是纯粹地希望靠自己的力量成为优秀的投手，并坚持进行着三倍于他人的特训。大卫则越来越欣赏这样的他，今天也在河岸边陪他训练。