Nagisa spends her time on vacation with Rika to try to keep Shino from finding out that dating both her and Saki.
If your friend was being two-timed, 
wouldn't you put a stop to it?
إن تمّت خيانة صديقك، ألن تضع حدا لذلك؟
Wenn der Freund deiner Freundin
eine zweite hat, schreitet man ein.
Si engañaran a tu amiga,
¿no querrías impedirlo?
Si engañaran a tu amiga,
¿no querrías impedirlo?
C’est normal
de l’empêcher de faire ça, non ?
Se un tuo amico venisse tradito,
non vorresti porre fine alla cosa?
Se sua amiga estivesse sendo
traída, não faria algo por ela?
Если подруге изменяют, 
конечно, я вступлюсь!