To save her sister Sonken's life, Sonsaku makes her way to the legendary training ground of Jofukuin. But awaiting her there are many surprises, some more familiar than others.
I cannot render myself vulnerable,
even for a moment.
Deshalb muss ich stets bereit sein.
No debo bajar la guardia.
No debo bajar la guardia.
Je ne dois pas relâcher ma garde.
Non posso rendermi vulnerabile, 
nemmeno per un momento.
Não posso baixar a guarda,
nem por um instante.
нельзя показывать
даже сиюминутную уязвимость.