It's waifu season, and this is exactly what "Shikimori-san is not just a cutie" delivers. The protagonist is your regular everyday normal guy haunted by hilarious bad luck where literally everything he does goes wrong in hazardous ways - to an extent where he wouldn't even be survivable on his own.
Fortunately (and miraculously) he landed Shikimori-san who's pretty much awesome in everything she does: cute, kind, athletic, smart and a tiny bit jealous. She's immortally in love with him, goes out of her way to please him and keeps him safe from all kinds of harm.
Seriously, half a season into this show that's all there is. There's a small ensemble of side characters with some exaggerated traits whose purpose so far has only been to make Shikimori-san appear even more awesome and desirable. There is no coherent storytelling, no character development of any kind and generally nothing you need to understand or keep track of. If you're looking for a shallow feelgood story that will cater to your waifu fantasy then you're gonna have a good time with this show. If you're looking for something more serious or deep though, then you aren't missing out on anything here.
