Oneshot

Sakura had lived with her grandma ever since her parents died in a car accident when she was three. When she turned fourteen, her grandma also passed away, leaving her alone. Just when she was about to give up hope having a family, out of nowhere, four guys claim to be her older step-brothers.
 
Note: Includes six one-shots 
Volume 10 contains the side story "Oniichan to Issho Kids: Takashi-kun no Kansatsu Nikki" (お兄ちゃんと一緒Kids 武くんの観察日記). 
Volume 11 contains the side story "Oniichan to Issho Kids: Miyashita-san Chi no Chrstmas" (お兄ちゃんと一緒Kids 宮下さんちのクリスマス). 
 
Parallel to the World (パラレル TO THE ワールド); LaLa DX 2003-01 
Gakuchuu (ガクチュー); LaLa DX 2002-11 
Mahou no Tsukaikata (まほーの使い方); LaLa DX 2003-05 
 
Himitsu no Tobira no Kugurikata (ヒミツの扉のくぐり方); LaLa DX 2005-03 
Chika Terashima is a 10th grader that wants a prince like in shoujo manga. One day, Chika and her twin brother Shohei switched bodies. Since they both go to a school with only 1 gender, they both have chance to find their true love. 
 
Santa no Iru Machi (サンタのいる街); LaLa DX 2002-01 
Shirayukihime no Douwa (白雪姫の童話); LaLa DX 2002-05 
Kimi to Boku no Uta (きみとぼくのうた); LaLa Special 2007-08