Tachibana Kazuya, Kumazawa Daigo, and Niinuma Hiroko all want to be popular. But they don't know how to do so! So, they try and create a club to research and find out how to become popular.
(Source: Renzokusei Scans)

Senou Natsuru, an average second year high school guy, has been chosen by the Moderators to be a Kämpfer. Kämpfers are given a bracelet to activate their powers and fight the enemy. Also, Kämpfers can only be girls, so upon activation, a guy would turn into a girl.

Suzuhara Ayaka deeply idolized her best friend, Shiroyama Hiroko. But when they were in high school together, Hiroko dropped out and vanished, telling Ayaka only that it was for something very important. Now, a letter from Hiroko to Ayaka has washed ashore with the corpse of a girl, asking for help.
Chasing after Hiroko, Ayaka goes to visit a strangely isolated high school for girls, which seems creepily eager to accept Ayaka as a student. Will Ayaka be able to uncover the school's secrets and rescue Hiroko before it is too late?
(Source: MangaHelpers)

The prestigious Aoi Academy caters to an elite collection of young magic users. But 17-year-old Kazuki Shikimori is a student who passes muster in name alone. He is the youngest in a long line of sorcerers, but the family's long-running talent for the black arts ended with this average student. That doesn't stop the female population of Aoi Academy from vying for his attention, though! His impeccable DNA will start a teenage war of lovesick girls!

The Kirionira are the demons that live in another dimension and invade the human world through their dreams. The only defense humanity has against the demonic assault are the hunters who rely on their sex drive as a source of power to fight against them. Riku Yoichi came from a long line of hunters and had high amounts of sexual energy which allowed him to be a great hunter. He moved away from his home town after middle school to demolish the Kirionira and was successful in finishing off the king and ending the battle forever. However, the peace came at the price of Yoichi losing his sex mojo. Returning back to his home town, he soon learns that the demon invasion was not over, but without his sex drive, he is helpless to fight back. He tries convincing his childhood friend Namba Midori and her female classmates to get him sexually aroused, but they want nothing to do with it.
(Source: MangaHelpers)