Serina got kicked on her bottom by Thai boxer in the "Sekai Wakagaeri tour",aired on NTV,January 26,2013.
Serina WAS a first generation members of SDN48 in the past.
In this series,women go abroad to get younger(as its name suggests since Sekai means World and Wakagaeri does "get yonger")and in this episode,they tried to grow younger in Bangkok,Thailand.
And,Serina marked worst score (on skin age)so she was punished in that way.
her punishment 79:00-