The self proclaimed "chief soldier" of Zvezda. In reality, Yasu is the only other low rank soldier other than Asuta Jimon. He has a tendency to get into trouble using Natasha's technology. Yasu is addicted to cigarettes, much to the resent of his fellow Zvezda members. He says he smokes them to uphold the "bad-boy image" he has worked hard to achieve. His loyalty to Zvezda stems from a fear of Kate Hoshimiya.

(Source: Wikipedia)