It's "White Day," the day that boys who received chocolates on Valentine's Day give their return gifts to the girls. And Momiji has one big surprise gift for Tohru!
Honda-san, it sounds like 
you didn't know this,
Wusstest du das nicht, Honda?
Honda,
parece como si no supieras esto,
Honda, tu ne semblais pas le savoir,
Honda-san, acho que você não sabe,
Хонда, ты, видимо, не знала,