While spending summer with his mother, Haru meets Ren, a boy newly adopted by his mother. Getting along with Ren isn't easy as Haru's goal is to "civilize" him by the time summer ends. Their relationship slowly improves as Haru spends more time with Ren and in return Ren steadily warms up to him. Can they really become a "family" at the end of summer!?
(Source: Bliss)

From Peccatore Sanctuary:
The cheerful and open high school freshman, Nakazato Haruka has fallen in love! With his classmate - basketball's club Tajima Kaoru. Haruka started his fierce attacks, and also declared "You will like me for sure!" How will the cool and quiet Kaoru react after knowing about Haruka's feelings?

Five years ago, almost every villager of Ootsuka died due to a tragic plague. But mysteriously enough, three survivors: a girl and two boys, emerged. Now living in a church, the three live in isolation, hidden from those who may seek to find them. Shino, one of the survivors, has control over the power of Murasame, the blade of life. But when the imperial church seeks to take the Murasame for themselves, their peaceful life becomes a thing of the past...
(Source: Bliss)

Evil women, beautiful men what else can you ask for? After WWIII, humans and Artificial People co-exist in a lawless world. Conspiracies, conflicts, and mysteries surrounding an innocent love story between a human and an AP. (Source: animeNfo)

[From MegKf]:

A story about a young man named Kazuma who has to deal with the fact that his twin brother, Naoki, loves him as more than mere brothers. Will Kazuma return Naoki's feelings?

from BLiss :
Summary: Living with a whimsical mother is hard enough for Tatsuya, but he is soon faced with an even bigger challenge; he finds out that his mother has married his teacher, and right after marrying suddenly disappeared. Kind hearted Takaoka, her husband, now has the burden of taking care of Tatsuya. They live together, and get along fine, but as their bond tightens Tatsuya soon starts having an alterior motive... Story also contain a oneshot calll first love

Fujishima Takara goes to high school and will start living in a dorm because he has lost all his family except for his father, who's always away for his work. Takara has to share a room with Hosaka Kiyomine. Living together isn't easy, and many rows ensue. Kiyomine is very introverted, while Takara is just the opposite. At first the two get on each other's nerves because of those differences. But things turn towards friendship and later on,towards love?