Long story short, the contest is actually a game where you have to find an onigiri in distress which has lost his way.
If you want to join this bento hunt contest, the only thing you have to do is write an e-mail to bentochannel (at) casabento (.) com and tell them where you have found the image of this little onigiri in CasaBento's site.
The image of Onigiri in Distress which you have to find in CasaBento's site!
The lucky winner will be randomly selected and will receive ALL the goodies below :)!! So, join in...!!! You have time to participate until midnight GMT +1 on 22nd June 2011. This bento game is open to everyone around the world! Have fun :)!