8月6日は妖夢の日 4月6日は妖夢の日 妖夢の日
Youmu day is a holiday dedicated to [[Konpaku Youmu]] from [[Touhou]].  It is celebrated on the two dates that form Youmu's name in "goroawase":[https://en.wikipedia.org/wiki/Japanese_wordplay#Goroawase]: April 6th (よ,む / yo,mu) and August 6th (よう,む / you,mu).
youmu day