Kanojo ga Flag wo Oraretara, Rokujouma no Shinryakusha!? Recommendations
Both have the same comedy, supernatural and harem genre.
Both involves a guy living by himself at first then his harem moves in with him.
Both involves large number and a variety of harem members.
One has a lot of plot twists, while the other one will be more focus on the harem arc.
One anime has the harem members appeared on a per episode basis, while the other one already has introduced the harem members on the 1st show.
The harem members from one anime were interested on the guy, while the harem members in the other anime were interested on the guy's room.
Both have the same mystery, comedy and harem genre, except in KgFwO, the each harem members would be introduce on a per episode basis, while in RnS the harem members came in on the very first episode.
Both are harem anime with a lot of colourful characters, the premise for both shows are also rather good, but they both get really bad when they go from all hilarious comedy to a more serious plot and only a little comedy here and there
the classic harem genre and the classic male mc who looks like a god in the eyes of the girls...
Both have the same situation where Male MC has girls moving in to the same living space as him (Apartment vs dorm) and indirectly creates a harem in the process. Both have plot going in all directions from silly to serious. Both also have the classic set of characters in a typical harem ("deres", childhood friend, etc.).