Nyotaika Shite Yandere Kanojo ni Naru | Turn into a Girl and Become a Yandere Girlfriend (Boku wa Nyotaika Onee-san)
Gag Jikuu no Onee-chan to Ero Doujin no Onee-chan to 11-ten no Onee-chan to Sex Suru Hon (Touhou Project)