While this type of mc didn't really suit my cup of tea I'll just shut up at the moment and see where the story takes me, I don't hate a mc where they're become a merciless killing machine as long as the goal is clear : revenge, the enemy is a scumbag etc.
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(Small rant)
But this mc oh man, is it really necessary to kill the party like that? I notice the importance of that apple but if the mc really that powerful can he just use a memory wiping magic or stuff? I mean yeah killing them would be the quick way but words will keep spreading no matter what happens, these party is an A rank so they might be famous and words will definitely spread that these "famous A rank party disappeared when they enter the mc forest", more people will still comes
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But that's just me I still put it in my reading cause I'm curious how the story goes (also I want to see the rest of the harem I guess)