@Arin-san, what the fuck are you talking about? Harem? There isn’t a harem in this, harem would mean that he feels or loves them the same way as they do and actively has some sort of relationship with them beyond being friends. There’s literally one other person that loves him, which she gave it her all and was rejected (Fleur, The Strongest Imperial Knight). Helga (Berserker Blade) just wanted friends, never really had feelings for Fooly. Of course, his sister loves him but that’s just close, close siblings. Melvie didn’t have any interest in him, just to defeat Sacred Sword. Demon Girl who fell in love with the human guy (who transformed to a demon for her) was only interested in defeating Sacred Sword Too. Still, even with all of that he (Fooly), time and time again, has shown he had only one person he loves...Leo (Sacred Sword). He never strays from that and never gives any other woman the light of day and consistently rejects them...well other then rating their abs LOL.
You’re view or definition of harem is seriously lacking. If you think harem just means a single male main character with multiple female supporting characters then you’re severely incorrect. If that was the case, damn near every manga would be considered a harem manga, which they aren’t…