【CAUTION！】Don’t read this book in the presence of other people ever! It has plenty of rough stuff， like dirty jokes， ultra-violence， racy sexy moments. But you will never feel awful and never stop laughing by a lot of gags which means true nature of human being， and automatically consider about what is happiness as a human. Have the number of overseas fans and have won various manga international prizes， Masahiro Nikaido has brought to his way of 「philosophy for Happiness」.