Kabayama Atsushi was a child prodigy, but now he’s just a regular high school boy. One day, a mysterious man from another world named Trance appears before Atsuhi and asks for his cooperation. Apparently Atsuhi is the chosen person who can save the world—by sleeping with Trance’s “sister,” Tsubasa! Already confused and overwhelmed, Atsushi is also targeted by a woman with strange powers that seems to know Trance and is determined to kill Atsushi. Does the world’s fate really depend upon Atsushi having sex with Tsubasa?

From ShoujoMagic:

Cool and gorgeous Nagisa paired with her perverted and stupid stepfather Ryunosuke makes for a hip-hop story that presents a father and daughter who cannot be honest with each other.

Life has been hard on Makoto lately, and she's nowhere close to her wish. She wishes to have a sweet, sweet life. When she's at the lowest of her luck, after her boyfriend took all her money and split, she's rescued by the handsome and rich Aeda CEO. To make things stranger, when she's supposed to get married to the ceo, she fools around with his son, without knowing his identity! Will she be able to find and choose the man that will be able to give her a sweet life?

From ShoujoMagic:
Yuki and Emiri are staff at Syrup Cleaning Service, but they actually only have one true goal... and that is to find their long-lost boyfriend, Akira. Also includes the 100p story, "We Are Also In Arcadia," where Ryunosuke from "Baby Pop" plays a role.

Smart, successful and good-looking Iwaya Sumire works for a big newspaper. However, her boss asks her to leave for being too "perfect" a woman. Feeling angry and dejected Iwaya returns home depressed, and most of all lonely. However, when she finds an unconscious young man lying in a box out the front of her home, she takes him in since he looks like a dog she used to own called Momo. She dubs him Momo and decides to "keep him as a pet." It's the start of an unexpected life together as they overcome obstacles and become quite attached to one another. But can love like this exist?

This manga won the 27th Kodansha Manga Award for shoujo in 2003 (shared with Hachimitsu to Clover).

Michiru is a happy child who loves to skate. During her childhood, she meets Leon, a cute innocent boy. They begin to ice dance together. But as she has a conflict with her mom, she plans to run away with Leon. Leon, considering the danger, declines Michiru. Hurt by this, Michiru runs away by herself. Finding out that Michiru has run away, Leon and others search for her, finding her in the skating rink. But the Michiru they find standing in the rink no longer has the smile that the old Michiru had!?

Chitose is an office lady who works seriously. Her childhood friend, Kokoro, is a celebrity.
He is a champion figure skater. But behind his success there are two peculiar characters: a witch and a knight. And when Chitose discover Kokoro's secret, the wheel of fate starts to move.