In the past, there's no komi rule. That's why Sai never lost when he plays black. Note: Komi is black is given handicaps because black has the advantage since it starts first. In Hikaru No Go, komi is 5 1/2 moku.

In Sai's extra chapter, we got to know that Sai is scared of toads. This scary guy looks like toads when he smiles, which terrifies Sai ^^;;