She taught Hitoshi that what is the most important thing in the
                  life, the happiness. She mentored Hitoshi that how to achieve
                  the one's happiness and she suggested to Hitoshi to care about
                  three things.
                  
                    - Life
                      
- Love
                        
- Understanding
                  
                  Without life, no happiness, without love, no meaning of the
                  happiness. Then she searched inside the Hitoshi's mind, what is
                  missing in him. She suggested to pursuit in the way of
                  understandings, since it seems that is Hitoshi's way. She also
                  suggested to try math, literature, art, and music. Because the
                  fun of math comes from its beauty. What she taught was:
                  without learning art, Hitoshi cannot understand the real beauty
                  of mathematics. Without learning literature, Hitoshi cannot
                  tell the beauty of mathematics. The music is the way of feeling
                  mathematics as Bach showed us a long time ago. The day she
                  taught this to Hitoshi, the SundayResearch has been established.