Tsubasa is ordered to score high on exams, so when the lovely Rena offers to tutor him, he accepts. He soon realizes that Rena expects a reward for her help. Minami spots them together and is thrilled at first, but then starts to feel very uncomfortable.
That explains a lot of 
what happened yesterday.
يفسّر ذلك الكثير مما حصل بالأمس
Das erklärt so einige ihrer
gestrigen Eskapaden.
Eso explica lo que ocurrió ayer.
Eso explica mucho de lo que pasó ayer.
C’est pour ça qu’elle a réagi
de cette façon.
Adesso mi tornano molte cose di ieri.
Isso explica muito sobre
a atitude dela de ontem.
Зато хоть понятно,
чего она так себя вела.