Riko heads to a shopping mall after school where a boy suddenly calls her by name.
While pretending to remember who he is, through their conversation Riko discovers she once rejected him.
It was in the suggestion box 
in the south building.
Estaba en la caja de 
sugerencias del edificio sur.
Estaba en el buzón de 
sugerencias del edificio sur.
Il y en avait aussi une
 dans la boîte à suggestions du bâtiment sud.
Estava na caixa de sugestões do prédio sul.