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
Human guy becomes step brothers with a buncha non humans (who still look human anyway). Theres a bunch of other couples and everything feels so... sparkly. Also I had a real hard time telling people apart.
Theres some drama about couple A (vamp x human) and the nature of vampires or something but its generally very... weightless? I dont think there was enough time toilet everything hit.
Supposedly there's a volume 3 but I dont care to continue so