Manga by author Kurumatani Haruko

From Midnight Scans:As a child, Beniko had two close friends, Umi and Sora. They were twin brothers that lived next door but due to his "Brother-Complex" jealousy Umi stopped being friends with her and soon moved away. Sora stayed and he and Beniko devoloped a relationship but later tragedy hit as he tried to save Beniko. Umi reapears with the same voice, looks, but a more twisted personality than before. How will Beniko confront the twisted love and affection given to her by Umi, instead of from Sora?!

Hosaka Taihei is a handsome medical examiner and he just switched jobs...to be a nursery teacher!! It's the first time he's experiencing difficulty in keeping a conversation with two years old. Isn't it cute to see an evil faced new nursery teacher? The start of a complex love begins in a kindergarten!

Twins Hikaru and Youta are an odd pair. Youta loves to cook and help out his family while Hikaru is a dark girl whose own family find her on the creepy side. Their everyday life involves Youta cooking and doting over his sister with Hikaru clinging on him. Then, on their birthday, their life changes. Youta learns that he is not related to Hikaru by blood and, while chasing after her, they both get hit by a car. When they wake up they find out that their lives have taken an unexpected turn.

From Shoujo Manga Maniac:Hana dreams of falling in love with a guy who is like a prince. She thinks that she will meet her prince by just believing. Finally she gets to meet the prince of her dreams; however, when Hana goes home, she's forced to attend a match-making session! And the prince, Ichiya, appears right before her. Hana believs that this is a destined match, but little does she know that Ichiya is not your average prince...!?Includes two side stories;The Proper Steps to a WeddingLover's Textbook