Okamoto Keito just arrive to his and his daddy apartment which is one of the higher security guard in Tokyo. Right when he turn on the light,he saw a figure sat on his couch. 

He was surprise and was think the figure were a woman ghost. 

"okaerinasai" said the women figure without looking to him. 

"who are you? " Keito ask with a trembling sounds and prepared himself if she answering 'I'm a ghost'

"I'm not a ghost if it what makes you freaked over me"

She stood up and walk towards Keito make the 21 years boy shrugs little by little to other side.

"don't be afraid, I'm not gonna eat you now" she make another movement that makes Keito more afraid to her.