Key is from this bundle: Humble Sierra the 3rd Bundle, the key could not be redeemed in China.

This giveaway has been presented by Hot Angel , otaku-centered shop. If you like anime and kawaii girls, you’re welcome to visit! Each sale there powers up a giveaway here.
Careful though, you may notice occasionally some 18+ lewd materials. Discretion advised.
Stickers | Phonecases | T-shirts | Xmas collection