Vampires

Shuichi comes back after a long absence from school to find his old friend Kura. No one else remembers Kura though. After searching Shuichi ends up at an old western style house where he finds Kura in the basement, in a coffin!?

Ace, a human teenager, has been raised by King and Jay, vampires who have lived an eternal lifetime. As he grows up, he became attracted to Jay and Jay also comes to yearn strongly for Ace's blood. King and Jay, afraid that their secret will be exposed, decide to send Ace away to a boarding school. But when Ace finds that out, he wishes to be a vampire like them.

Vampire school. Uke is the only human there. Uke has to close up himself in his room or the vampires would eat him in his sleep. They don't let him sleep by jolting at his door & windows.

Guy got killed in a drug store - was afterwards safed from a teenage vampire. The guy is an "S-Class-Human" - means the vampire - because his blood is so delicous. The vampire wants to be the humans master so that the humans blood is exclusively only for him. They live "now" together so that the human is safe from other vampires.

First book: http://www.mangago.me/read-manga/shin_toukyou_yuukaku_monogatari/mh/c003/

Now sequel: threesome between Jan+ Jirudorei (Jan's bat) + Asu

Park Min Gyeom has a disease called hemochromatosis - his blood absorbs too much iron, so he has to donate it regularly to stay healthy. One day, after a blood donation at a clinic, Min suddenly gets attacked by a vampire at broad daylight. Next day in his new school Min realises that this vampire is one of his new classmates and is also sitting next to him!!! Because of a sudden collapse Min offers the vampire Chun Sam his blood. A curious friendship between "predator" and "prey" begins.

Kyon works at a rich mansion as a servant. The owner named Lucaon is a Zero hunter and got one red eye. This eye is the proof of nearly becoming a Zero himself. His parents were poisoned by a servant, so there is nothing he hates more than servants. But the shy Kyon begins to attract his attention.

Raine, who’s been living alone after his long-term partner passed away, decides to adopt a vampire kid named Joel to fill the emptiness of the house and his heart. But after giving him real blood instead of artificial blood, Joel starts to grow very quickly.