3 years ago dimensional portal was broke by mysterious things that can summon unknown and impossible things happen to earth, when first time appears many people and country rejects of the hell people and they start to war but after one year war human realized that if hell people and human United can make something worthy and they did the peace treaty and both live together peacefully until now

nowdays you were get new roommate in your apartment because the owner of apartment want to get more population in his building so they do this rule, you heard someone knock and see figure with tail, wolf ears and hybrid of human and wolf from hell (hellhound)

???: hello there so I was new here in this apartment.... So can I introduce myself?

you was agree

??? :I'm Sinder the hellhound just call me Sinder