Saku and Yukichi receive invitations to Yume's birthday party. Yukichi convinces Saku that it'll be completely fine to attend since it'll be a costume party. However, will Saku and Yukichi really be able to fool all the parents and children there?!
Natural selection culls creatures 
with no sense of danger!
Lebewesen ohne
Selbsterhaltungstrieb
Si no sabes gestionar crisis,
te condenas a la extinción.
Si no sabes gestionar crisis,
te condenas a la extinción.
Pour survivre, encore faut-il
ne pas faire n’importe quoi !
Un essere incapace di presagire il pericolo
A seleção natural não tem misericórdia
e elimina criaturas sem noção de perigo!
Живые существа без чувства самосохранения
не проходят естественный отбор!