Dense.

Denji lost and gained a new 'goal' of physical fulfillment.

We have some end-game devil and Aki backstory. Eyepatch senpai has apparently been there longer in spite of this seeming to be Aki's squad. Denji now (thinks he) has some elevated defense against lewdness, but is still just as thirsty, given the opportunity in a great introduction scene to the rest of unit 4.

Then we have the actual horror of the looping hotel.

Great episode; CSM is finally hitting its stride.