The Ore wa Subete o “Parry” suru: Gyaku Kanchigai no Sekai Saikyou wa Boukensha ni Naritai series reminds me a bit of One Punch Man, featuring as it does a protagonist who became ludicrously strong after having trained too hard. That’s the only real similarity though; their personalities are completely different and the comedic focus here is on a cavalcade of misunderstandings and poor communication skills rather than parodying battle shounen tropes.
Eris no Seihai meanwhile starts off with a compounded version of that standard ‘girl gets framed by the person stealing her fiancé’ trope: The classic variety which happened in the past (and resulted in the production of the ghost half of the protagonist duo) and a modified version that serves as a spark for the main heroine. The problem with this novel is that it’s extraordinarily scattershot… it has no idea what it wants to be. A romance? A comedy? A thriller? A mystery? All sorts of elements clash against one another here in a particularly unpleasant manner.