Aino Seiji is your typical male high school student when he meets Guri, who is a shinigami? No, a pervert--no! An angel?! Guri introduces him to the Kiss Note and explains that if he doesn't kiss someone within 24 hours, she will die. So it's off to Seiji's school to find his school crush, his classmate, Hiyama Akane, but of course nothing is ever so simple...
Does that mean I'm now my sister's lover?
Bin ich nun die Geliebte meines
Schwesterherzens geworden?
¿Eso quiere decir que soy
la pareja de mi hermana?
¿Eso quiere decir que soy
novia de mi hermana?
Ça veut dire que je suis
en couple avec ma sœur ?
Significa che ora
 faccio coppia con mia sorella?
Quer dizer que agora eu sou 
namorada da minha irmã?
Значит, теперь 
мы с сестрой — возлюбленные?