A long long time ago the Malays practiced magic and witchcraft in their daily life. They make agreement with things unseen and took a SAKA under their wings as a form of protection. With every agreement, deals are made (never meant to be broken).
SAKA is the general name they called their guardian but some deals are forged with spirit, another with ghost, and the worst with a demon. For every SAKA have their own terms and needs to be fulfilled in exchange for the so called loyalty and demons always demanded the most.
Inherited from one generation to another, the cycle very rarely ends despite the modernization. (Not without great sacrifices.)
No matter where you are, it'll find its Master... It doesn't matter if you'd forgotten your promise... It doesn't matter if you knew nothing about your family's curse... The SAKA will come to 'serve' you as long as its First Master's blood course through your veins. Especially if it only want you... And love you...