Kotoko receives a request for help from a giant snake, who is the guardian spirit of Tsukuna Swamp. It appears that a murderer named Tanio Aoi disposed of a body in the snake’s swamp, but there’s something that’s just not sitting right with the snake. After learning about Kuro’s powers, Kotoko asks Kuro to accompany her on this journey, but Kuro declines for a certain reason...
will become immortal 
and gain eternal youth.
.يصبحون خالدين ويكتسبون الشباب الأبدي
wird man unsterblich
und altert nicht mehr.
se hacen inmortales
y con juventud eterna.
goza de inmortalidad y juventud eterna.
que la chair de sirène
rendait immortel.
ottenesse l'immortalità e l'eterna giovinezza,
se tornam imortais e ganham juventude eterna.
обретает бессмертие и перестаёт стареть.