Buddy Strike (バディストライク) is manga written and illustrated by KAITO. It was serialized in Shone Jump Weekly.
It is said that there is a legendary catcher who can turn any pitcher he forms a battery with into a star. But this catcher requires something in return—the pitcher's soul. That is why the catcher is also known as the Grim Reaper. The pitcher will throw his soul into each pitch until that pitcher dies. But for down-on-his-luck pitcher Ryo Arakami, this may be the deal he was looking for after all!