Oh, so you know about memory editing too. Heheheheh~
In this case, it's not too hard actually (I found the address without even narrowing down the address range). Just don't forget to manually save the game after receiving so much spam mail
This isn't an RPG anyway; the hit counter is just mainly used to unlock stuff, so I don't think it's much of a gamebreaker (unlike Patapon 3, where the game's very buggy implementation has made it so that even the slightest of hacks to keep breaking the game. That's actually good, until it was found out that it could potentially 'infect' the innocent users on multiplay and break their game without them even doing anything, making the entire Patapon 3 online community very sensitive to these kinds of exploits)