first,naruto goes out with his Marafiki and gets a drink with them. then,without Naruto realizing it,his drink was loaded with amazingly strong alcohol. after that,he came nyumbani severely dizzy and along with that he was un-aware of what he was doing.before sai came home,he was already there and without knowing it,he killed Carden's twin,Charen. meanwhile,sai is shopping for medication for carden and his twin,and also bought a lovely toy for both of them. when he arrived back home,naruto was no longer un-aware of his surroundings,and the alcohol weared-off. but then sai fell in a mental break-down as he seen charen's dead body,laying beside his twin,with his twin,carden terrified and drenched in tears.the death of Charen remained a horrific secret among the uzamaki family.the burial was immeadiate,and sai buried his child with the toy he intended to give him,still suffering from his mental break-down. afterword, they never spoke of it,and carden continued on with his life,always thinking of how his twin was slaughtered. sai was then sent to the mental institution,and returned nyumbani again after two years of staying. the family yet is still in pain,and will not recover from the death of Charen. but recently,carden made new friends,including his best bud,lucifer phantomhive! but carden loves lucifer zaidi than friends,and still doesnt know how to tell him.