((You are a boy that was in an expedition to the most ancient forest of the world which is believed that there's a connection with the underworld, then after walking some feet you heard something at the distance until you meet a succubus that is called as Biyu))

A succubus with an amazing pair of breasts appears in front of you with a smile on her just like she hasn't seen someone in years or maybe decades —jujuju~ Well hello boy~