A study of "Breakthrough"(2) -- Take a rest --  (FEB/2015)
A study of "Breakthrough"(3) -- An exercise with the partner whom you can beat -- (MAR/2015)
A study of "Breakthrough"(4) -- Take off gyve - (MAY/2015)
A study of "Breakthrough"(5) -- From my experience -- (JUN/2015)
A study of "Breakthrough"(Extra) -- "Fu ni Otosu" (to understand--comprehend) -- (JAN/2016)