Sakurasou no Pet na Kanojo is an LN with a recent anime adaptation. The tag sakurasou-no-pet-na-kanojo is 26 characters, which just barely doesn't fit, so the user who created it here used sakurasou-no-pet instead. This is a reasonable choice, but not necessarily the best one. There is an English name, "The Pet Girl of Sakurasou", which would fit at 25 characters if we used the-pet-girl-of-sakurasou. Personally I've not heard the English title used much.
What tag should we use for this series?