Sometimes I see "interesting" manga excerpts on Instagram. The same here and I had to take a look. A rather unpopular teacher suddenly meets a girl who thinks she knows him. As he doesn't want to damage his reputation any further, he tries to keep her at a distance until she reveals herself to be a monster girl who evolved from an octopus that he once rescued. The manga "Ano Toki Tasukete Itadaita Monster Musume Desu" is VERY short. Not much happens here yet, but a lot is hinted at. I can't and don't want to say much because otherwise I would spoil it. The mangahas a few SPICY moments - if you know what I mean and I'm still unsure how much I'm sold on it.
It also seems to be rushing through a lot very quickly at the moment, which I also don't like.

That said, this has the potential to be a good, nice little story.