The second day of the Geeks on a Plane geeky spree in Japan was completely filled with (mostly) insightful presentations, panels and pitches from newly launched Japanese start-ups (here is an overview of day one). The Startonomics Tokyo event was held Tuesday at the offices of KDDI Web Communications (one of Japan's biggest hosting providers) in downtown Tokyo. What follows is a brief overview of what you missed during that day, followed by a quick summary (and full video) of an on-stage interview with Kenji Kasahara. Kasahara is CEO of Mixi, Japan's biggest social network, and openly spoke about his success story (the interview was done on the third and final day of GoaP's Tokyo leg).But first, here is a summary of all the presentations and panels that the GeeksOnAPlane witnessed during Startonomics Tokyo.