Eno becomes the student council vice president and Sayo becomes the treasurer once again. The five members of the student council are as eager as ever to resume their love lab. Riko breaks into a cold sweat when the other members begin treating her as their master of love after she blurts out a lie.
that means you remember 
the day you started dating.
así que sabes cuántos 
días llevan saliendo.
así que sabes cuántos 
días lleváis saliendo.
ça veut dire que tu te souviens précisément du 
moment où vous avez commencé à sortir ensemble.
você deve saber por quantos
 dias vocês estão juntos.