If you're looking for manga similar to 100-man Pound no Ai, you might like these titles.
The playboy Haruya’s rule is to not decide on one girlfriend. I don’t like crowds so I can monopolize Haruya…!?
Life as the Mayor's daughter in a small town is suffocating and boring for Rita. The only one who doesn't give her special treatment is Raz, the town cleaner, so she constantly seeks his attention... by graffitiing the town.
Is love between adults and high school girls really taboo? Ritsuko's boyfriend, Yuuji, is an outstanding office worker who works in a foreign company. He always treats Ritsuko like a little kid just because he is seven years her senior. Does Yuuji really like me? Ritsuko is always insecure. Do I really like Yuuji? Can we really be together?
Rinne is a girl who can see and exorcise ghosts (usually with a paper fan). When the school punk saves her from getting hit by a truck, but ends up in a coma himself, she, and his disembodied spirit must defend his prone body from being possessed by this, that, and the other local spirits. Unfortunately, she fails in her task, and an ancient playboy takes over the punk’s body, leaving him to inhabit a pink stuffed monkey. Hilarity ensues.
Kasahara Miori, known as the pure and noble Ojousama in the school, is also known as the Hotel King's daughter. But one day, playboy Toraguchi finds out her secret. What should she do now...?
Misao has only been going out with Tsukasa for a week, but he's a notorious playboy and she's a virgin. She loves him, but she's nervous about sex...
Asako lives her life day-to-day acutely aware of how lonely she is. That all starts to change when she meets Hongo, a boy who thought she was trying to commit suicide and tried to stop her. They form a bond and find how much fun life really is. Until Asako finds out about Hongo's past.
Hana Kisugi is a somewhat apathetic 28-year-old office worker with no luck at work or with men. One day, she missed a step on a staircase and... When she woke up, she was in the body of a 17-year-old high school student named Hana Yamada. At a loss, she ends up living the life of a high school girl at the boarding house Hana Yamada lived at, Ikuta House. She's surrounded by the responsible adult Haruki, and the high school boy Haruchika. She's having trouble not falling for all the guys around her, but she can't fall in love in someone else's body, can she? While she's worried about that, someone tells her HE'S in love with HER! Will this Hana be able to return to her former body?!