親戚 (shinseki) in Japanese means "relatives" or "extended family." It refers to family members beyond the immediate nuclear family, MailMate.jp Guides and Tips Archives - NookGaming
As this is explicitly adult content (18+), it contains graphic sexual scenes and is intended only for mature audiences. shinseki no ko to wo tomadirakara
From an astronomical standpoint, the phrase could allude to celestial events or phenomena. "Shinseki" could imply a new star or celestial body, while "Ōtomadaira" might suggest a large-scale natural phenomenon like a whirlpool or could be a place name. 親戚 (shinseki) in Japanese means "relatives" or "extended