I will be লেখা these প্রবন্ধ to help people with জীবন্ত terms they do not understand. I will try to use two terms that are semi similar to eachother.

Part one harem and male harem

Male harem অথবা reverse harem
Is a story revolved around a girl where quite a few handsome guys fall for her all at once. While it is partly funny it s usually a strict cheesy romance. Depends on the জীবন্ত but it almost always has guys running around without shirts so consider it perverted regardless of জনপ্রিয় belief. The most জনপ্রিয় is vampire knight.

Harem is a জীবন্ত revolving a guy with a similar problem. Harem are usually super funny with perverted comedy with a hint of comedy. Often the guy is clumsy and gets himself beat up for accidental harassment অথবা something.
The main girl often has পরাকাষ্ঠা hair and a clueless attitude. They are almost all ecchi for the reason of having perverted humor and funny moments. The most জনপ্রিয় is rosario vampire.