Oh this story was hilarious! Shirou one-hit killing everything that crossed his path never got old, you'd think that people would learn after a while... Any chance that it's Waver Velvet who was the mysterious professor with Rider mentioned at the end? Looks like Alexander is back since Waver would definitely try to summon him again.

Great job with spelling and grammar, looking forward to the pseudo-sequel! For all I know it'll be Shirou being teleported into an alternate timeline during the 4th Holy Grail War and wreaking havoc!

First i have to say that you sir are a genius.

This is the first Onepunch-man fic i have found/read, i hope this fic will encourage more people to read the manga and/or start using it more in fanfiction.

To tell the truth, after reading Onepunch-man the first time, a story with a similar premise, Shiro doing Saitama training, did come to my mind, unfortunatly i have no talent as writer so i didn't even try. I am happy that someone else came up with the same idea, and unlike me had the talent to write the story.

That said you made a minor mistake, ORT is from Mercury not Jupiter.

I LOVE THIS! THIS IS AWESOME!

my only problem is that it isn't a harem.

Only one word can describe what I feel about this:

YES

This was an awesome crossover! Truly, being the strongest makes things pretty damn boring. This being a ShirouXSakura fic is just icing on the cake.

Keep producing glorious works and stay golden!