M-chan's manga / #multiple couples(1)

7 chapters In this world humans evolved by mixing beast blood with then & are mainly divided into vamp ,lycan & siren (aka the beast of blood-BOB- Mpreg possible).. Haruka's dad has always been troublesome doing things on whim & he had to clean up all the mess ..so when his dad decided to remarry again & suddenly live in with his new husband and his three hot step Brothers Haruka's life took a 180' turn & even his new school is a special one mostly attended by BOBs & a vamp who already marked him