From Manga Abyss :

Yoshino Haruka, 16 years old, substitutes for her sister at an arranged meeting and ends up falling in love with Kunihiro-san... To discover the day after that he is her new home room teacher ! How are the two of them going to deal with this forbidden relationship ?

The class is changing seats and Momoka got stuck sitting by Narumi, the weird kid in the class. He has long hair that covers his eyes, he doesn't talk much and when he does he is kind off scary, and a circle of rumors follows him everywhere he goes. But is Narumi really a weird boy? Or is he just misunderstood? what kind of pure love could result from this...?

Mashiro lives on an island surrounded by sea. One day, A glittering young boy come from Tokyo and the love has begins...?

(Source: Chibi Manga)

From Nagareboshi Manga:

Hina has just moved back to her old hometown, and transfers to the local school, North High. Little does she know about the rivalry between the gangs of North High and its opponent South High (the high school which her childhood friend, Kanata, attends). During her first week there, she is captured by gang leader Shuugo and finds out about the "Princess Game", in which she will play a key role...

Koharu and Nat-chan are childhood friends and neighbors. They were always together... together with their panda. Can love bloom between childhood friends?

From Awakened Memories:
Wakaba got locked up in an elevator with a completely strange guy. Moreover, they happened to share a kiss. He's someone she'd never meet again...or so Wakaba thought, but it turned out that that guy, Chitose, is the boyfriend of Nao, her friend! Nao introduced a surprised Wakaba to her upperclassman in her club, Takaomi, but no matter what, Wakaba can't forget about Chitose....

If the time I have left is short, then I want to at least know love. There are only three months remaining. Madoka chooses "to fall in love with someone..." A dramatic love story that pains the heart starts!!

First love. Reunion. Misunderstanding. Passing by each other. And...a teary happy ending.
"When you can play this tune, play it for me"...Suzuno has always been searching for the boy who told her that, whom she met at a piano recital when she was small. After entering high school, she was chosen to play the piano to accompany a chorus competition. Suzuno started practicing with Aiba-kun and Fujisawa-kun from her class, but Fujisawa-kun told her that they used to meet when they were small...!?