Book (Practical) Home economics and life sciences The heart and body of a boy that I want to convey by the age of 13

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Home Economics and life environment studies
『 : The heart and body of girls that I want to tell before the age of 13 』 (14th print 42000 copies) 『 : How to protect your body and mind that I want to tell girls before the age of 15 』 (6th print 15500 copies) is a sibling book. It explains the body and mind of boys in a manga format in an easy and easy-to-understand way, such as the body and mind that is difficult for mothers to explain, advice for becoming an adult that can take care of yourself and the things around you, etc.