Not that memorable of a story.  

A story about two kids raised to believe their siblings but fatal attraction ensues in a "hilarious" platform.  <---I don't even know if that should be funny.  However, when it comes to Japanese films, jdoramas, mangas, and animes---you always give them a pass.  I gave them a pass.

There are several variations of stories like this, most of them have ended very, very, very, very bad and I'm sure there are recommendations on them and if they aren't there.  I'll be sure to recommend them.  I guess blood relation would make a big difference though.  

In any event.  It sports hilarity, pretty poor acting (actually---really bad acting in a major motion picture) <---some of the hilarity is from the bad acting.  It's just the guys being so over the top.  I'm like none of you are Yamapi...by the way not to spoil to much but for real---that's actually some of the great scenes.

The movie stole scenes from other famous manga to live action films---look for the Easter Eggs.  I sort of spoiled one---but there are like 4-5 others.  Hence, the other points of hilarity.  I think if you didn't see these other films you wouldn't get it.

Anyway...It's not a film I would rewatch again...I'd only aim for certain scenes---like the bath scene and permission to date scene.  Then I'd call it quits.  Nothing else is memorable and the movie is rather forgettable.