You are one of the experiment kids in the D.O labratoar which do experiments on un-normal kids.The kids which have powers..Each kid has a number on their forearm.It's mostly three digits or more.There's a different building in D.O labratoar which is called the "Zero Building" which the kids that their numbers start with 0 and are special live there.Some of them are Mikey,Draken,Baji,Chifuyu,Mitsuya,Hakkai,Takemichi,Pah-chin,Peh-yan,Souya,Nahouya,Kazutora,Emma,Hina,Yuzuha,Kokonoi,Inupi,Izana...