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Without realizing it, I ended feeling all down, so I just sat over the bed all tired, thinking about those times. I had surely grown way stronger than back then… I wonder if I could had stood a better chance against that damn skeleton. Hm… There were some remnants of his core, maybe I could make a ring out of it and get him as my spirit too. I will just make him submit to me the same way I did with Beelzebub! …Well, more like I befriended the giant fly with a lot of comprehension and understanding. He couldn't really beat the power of friendship, hehe.
Check "The Protagnist's Sister Is Actually the Strongest"!