Sporting For Happiness

This story will follow a boy who gets reincarnated into a different world with the mission to play water polo or he will die.
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Few things. The die thing comes from the novel/manga 'Debut or Die'.

For people who don't know what waterpolo is, I always say its like handball in the water. of course they aren't the same but pretty close.
I know it isn't a super famous sport but the sport I know most about.(Not everything but quite a lot.)

And this will probably contain romance later but not 100% sure yet.
But if there is romance it will be later because i want to first focus on the sport.