^Although it's also clearly said in the main series in episode 10 when Tougou visits Sonoko again. And you could figure it out even earlier if you realize why Tougou had three fairies from the start.

last edited at Jan 5, 2020 5:34PM

Wanderer, watch the sequel (prequel): Yuki Yuna is a Hero: Washio Sumi no Shou for the reason.

oh shoot-