Kokkoro arrives at the post office to send a letter, where she is unfortunate enough to encounter a group of robbers who have broken in. In order to recover their stolen letters, Kokkoro joins forces with two Lucent Academy students named Suzuna and Misaki to pursue the thieves all the way to their hideout...
for other schools without 
our teacher knowing...
...من مدارس أخرى دون معرفة مدرستنا
sin que la maestra se enterara.
sin que la maestra se enterara.
per delle altre scuole
all'insaputa della nostra professoressa...
sem a nossa professora saber...
для других школ
втайне от нашего учителя.