You know why this arc is bad?
Is too long for a sidequest. The character which they came to save is not introduced and is unlikable.
It comes inmedietly after introducing the new team, but none of them got a proper introduction, Sosugou has not even presented herself to the reader, and they get pretty sidelined anyways.
Theres too much meangering and random fetish fuel.
And worst of all, you cannot skip lt.
If it was cut to half its lenght it may have been, way, way more palatable.