No God in Eden Vol. 4

Thanks to a last-minute save by Takai's father, Takai and Nishio manage to ditch their training camp before their fellow classmates catch on to Nishio's condition. But now they have a bigger problem on their hands-how will Takai persuade his parents not only to allow Nishio to stay in their home, but not to disturb the two of them for his entire week-long heat cycle? With his parents noticeably suspicious, has the time finally come for Takai to expose their secret?