Muhyo & Roji's Bureau of Supernatural Investigation, Vol. 5: Swallows in the Wind

Muhyo is exhausted from fending off Enchu's minions, so Biko whips up an elixir to rejuvenate him. But will the elixir be enough with the abominable Enchu blocking their path to freedom? What terrible scheme does Enchu have in store for Muhyo and his friends?