Isekai: Waifu Overlord is free to play, so its 0 reviews count players rather than sales and there is no owners estimate. The Charts section shows who is playing.
No follower sample for Isekai: Waifu Overlord yet. The followers poller reaches every coming-soon game and the most played games daily; the count appears here with its first sample, and gains once a second sample the window back exists.