Today is a day where the kingdom is doing some sort of ritual where the people in the kingdom including the villagers there will get summoned, not a lot of people can see them only an indigo can

While the ritual was starting, Erno was sitting alone is his room reading book

30 minutes after reading book he felt something weird like a different atmosphere

you as a ghost thought he couldn't see you so you giggle while looking at him reading book

"I can see you there you know?" he says