Sawaranaide, Kowareteimasu
Chapter 1: vampire teacher that was discovered by a lethargic bored student. Chapter 2-3: student who discovered a somewhat secret room which he met another student which was a person he knew in current time(parallel world? Quantum physics?) Chapter 4: soccer club member was kick out due to violence, have to find another club being transferred to astronomy club who have only 1 club member and on the verge of disbanded but the senpai have weird rumors around him, which were not all are true and eventually they got a bit close and the rest is history. (felt like rushed ending)
Egomix
Chapter 1: musician met an accident that needs his arm to be removed but a vampire save it by turning him to vampire, now the musician thought of repaying the vampire by physical relationship as demanded but he doesn't know that the vampire loved him and found the one who could play the instruments made was him. Chapter 2: the older sibling's mother died so was taken by father to the main family but the little sibling who was the legitimate son was born so this begins the hellish life of older sibling since the legitimate wife despises him. When the younger sibling grew, he become closer to his older brother thus protecting his older brother from his mother but one day the mother told the older sibling to commit suicide so he obeys, fortunately saved by younger sibling, the mother was put in hospital for mental problem. As they grew up the older brother became slave of the younger sibling, he missed their innocent childhood days since he was tormented by the younger sibling. One day the older sibling return home only to be attacked by their mother which nearly killed him but the younger sibling saved him and promised to get out of his life since he was suffering but the older sibling refuses and continue to live together.
Hana to Junketsu
Sequel: Scarlet Freesia
Scarlet Freesia
Prequel: Hana to Junketsu
Koyoi wa Kimi to Chi no Kisu