Watari-Kun No Xx Ga Houkai Sunzen

Briefly about Watari-Kun No Xx Ga Houkai Sunzen manga:

Ever since his parents died, Watari Nao's life has revolved around his little sister. He forgoes club activities for the sake of spending time with her, leading many of his peers to label him a siscon. But as long as his sister's happy, Nao is willing to shut out any unwelcome comments about himself. Unbeknownst to Nao, however, a greater danger has resurfaced - one which's forced his sister to commission him a servant.