One morning, at the end of one of their usual arguments, You Keika learns about the life and death relationship between a Youmeishi and their spirit shadow, as well as the weaknesses of this from Tanmoku Ki. Along the way, Keika learns about the Tanmoku family's treasured sword (the Rakugetsu sword) as it is being taken to the family mausoleum in preparation for the pledging ceremony. He then finds himself under attack by Shito Ritsu who bears a strong grudge against Tanmoku Ki. When he soul is about to be broken apart Keika reaches out for the sacred sword...
It takes it's name from the first Youmeishi, 
Tanmoku Rakugetsu, and is known as
إنه يحمل اسم أوّل يوميشي، تانموكو راكوغيتسو
ويُعرف أيضًا بسيف راكوغيتسو
Es wurde nach dem ersten Yōmeishi
Tanmoku Rakugetsu benannt.
Tiene el nombre del primer youmeishi,
Rakugetsu Tanmoku,
Tiene el nombre del primer youmeishi,
Rakugetsu Tanmoku,
Elle a été nommée Rakugetsu,
d’après le premier exorciste,
Fu impugnata dal primo Youmeishi, Rakugetsu Tanmoku,
Ela leva o nome do primeiro Yomeishi,
 Rakugetsu Tanmoku, sendo chamada portanto