It's clearly one of the best isekai I stumbled upon. There is no harem, no ecchi, almost 0 tropes but the shut-in main character.
I'm not fan of manga action with almost no dialogues and messy action scenes so I don't mind a very slow paced story like here, also some of the opponents reminded me of the video game playstation2 shadow of the collosus.
It's true than he "is" op but that's still funny how he struggles from the random items he brings from the Earth to make up for attacks based on his chuuniness.