The person who always stayed behind the shadows of his all rounder friend, suddenly got the interest of an otherworldly beauty?
And not only that, the girl happened to be a vampire?
And to add fuel to the fire, the vampire is going yandere over a person who always thought himself as a MOB?
'Eh...its not be with protag aura...why are you coming near me. I just want to live with my solitary!'
'If Kei-kun wishes, then my name is solitary from now on~'