Hayate and Kusanagi are best friends. They are pretty popular in their high school, and they always attract a lot of "unwanted" attention because of the ambiguous attitude that Kusanagi harbours sometimes torward Hayate. Invited both to a students counsel's sponsored meeting about UFOs, they stumble upon Hayate's little brother, Tatsumi. Hayate gets into an argument with him because he thinks Tatsumi shouldn't be there. And Hayate didn't know ho much he was right, when, after the meeting started: a UFO crashes nearby the student group...
(from B-U)

High School student, Ryouichi lies about his age while having drinks with Shintarou. They spend the night together and the next morning the truth is revealed. He thinks his only problem was that he slept with the man the night before, but he is in for a surprise when his mother introduces her new darling.

nohara Minato is an only child who was raised single-handedly by his father since young, after (believing) his mother passed away. When he skipped club activities one day, an exact replica of himself showed up, claiming to be his twin brother who was separated from him when their parents divorced. Just what is going on between their parents? And as more obstacles come his way, what will Minato and his twin’s relationship blossom into?

From Baka-Updates:
Lawyer Gamou Toshiki and Prosecutor Amamiya Hiroaki met in college and quickly became friends, but for the serious Gamou it was love at first sight toward the charming Amamiya. After being separated for several years, Amamiya has moved back to Tokyo and though Gamou knows there's no chance of anything other than friendship, even that has to change...

Tamaki, the son of a yakuza family, is friends with Tomoyuki who is 12 years older than him. One day, Tomoyuki kisses Tamaki. Tamaki becomes confused and runs away but before he has a chance figure out his feelings, Tomoyuki goes abroad for 3 years without saying anything or keeping in touch with Tamaki. Now Tomoyuki is back in Japan but he's avoiding Tamaki. Can the two become close again?

Also look for Tsumasaki ni Kiss which follows the secret love of Homura (Tama’s older brother) and the heir of his rival group.

Spell (Taken from Yes_Rhade): Brothers, Akira and Itsuki, are in love and live together. There seems to be unresolved issues.

Osawa Takatoshi is alone, his father left the family years ago and his mother is deceased. Now, Death God, Black, arrives at his door with a ring in his hand and a desire to eat curry. How can a Death God and a human find true love? And if they do, will they be able to stay together?

Touma returns home from Paris where he was studying to be a patissier when his father, an artisan making traditional confectionary, collapses. His father is all right, but the relationship between father and son is awkward. Then Toumaa€?s fellow patissier apprentice and sex friend, Solomon, comes chasing after Touma. Solomon is impressed by the Japanese confectionary made by Toumaa€?s father and claims that he wants to become his apprentice!

A wolf from the countryside moves to Tokyo searching for a wife. He is recruited as a host, but his new employer turns out to be a vampire?!

Separated in childhood, Naoya is reunited with his best friend Tsukasa through his work. Though he is seemingly cold and distant, Tsukasa can't get Naoya off his mind. However, when Tamura, Naoya's co-worker, starts to show signs of affection towards Naoya, Tsukasa's jealousy is spurred. Can love blossom with so many obstacles in its path?
continues in "Perfect world"

From Nakama:
A novice mortician who takes care of death, and a surgeon who saves lives. They’re in very different positions, but the distance between them is closing…

From Yes_Rhade:

Kaname and Tooru have been lovers for three years, but Kaname just can't accept their love. Why? Kaname is Tooru's uncle, and no matter how much Kaname loves Tooru, he realizes that their relationship is wrong and should not continue.

Unique personalities under one roof. Falling in love is hard—Heart-warming love!

Kiichi came to 'Tokyo to enter university and to live in share-house accommodation. He starts to fall for a good-looking salary-man he lives with....

1) Machina Angelus - Angel's Temperature
Yuya was all alone after his grandfather passed away. Then Kou, his childhood friend, who abandoned Yuya reappeared back in his life. Unbeknownst to Yuya, Kou has a debilitating disease that forced him to leave his side. So in order for Kou to see Yuya again, he decided to become a Machina Angelus (Machine Angel), a machine he founded! Will the single-minded determination of a genius create a miracle?

2) Machina Angelus - Angel's Oblivion

3) Spicy Hot Life
Osawa Takatoshi is alone, his father left the family years ago and his mother is deceased. Now, Death God, Black, arrives at his door with a ring in his hand and a desire to eat curry. How can a Death God and a human find true love? And if they do, will they be able to stay together?

Extra) God's Left Hand

The women in the Chidori family have the reigns firmly in hand.
Then a cool young man appears among them as the mother's new assistant.
(Source: MU)