Null & Peta: Slippery and Sticky! Big Sister Bikini Battle! Watch anime Alternative: Null Peta: Doki♥ Nullnull Petapeta! Mizugi Darake no Onee-chan Taikai!; Null & Peta: Slippery and Sticky! Big Sister Bikini Battle! Type: Updating Status: Genres: Comedy - Ecchi - Sci-fi View: 6