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Nippon Essay Essay : More than 2.2 million copies in total! Life Hack Essay, a must-read book for living alone in your 40 s, presented by Boku 『 and Otalieman 』 no Yoshitani. The author directly covers all the things that a single man in his 40 s (even if he is not a man) wants to know about, such as jobs that are starting to look into the future, money and investment that you can only worry about, raising the level of housework in case you may be alone in your life, what to do with your declining health situation, how to maintain marriage hunting and human relations in the future, and so on! This one volume can protect your body and mind.