This article focuses on “conflict”, which has hardly been focused on so far, and discusses that with its occurrence, which develops mutual understanding between individuals, make them recognize diverse values and deepens their participation in learning activities, it becomes an indispensable component in “lessons exploiting personality”, which has been paid attention to so far mainly in terms of personalization. In which, through a case analysis of life studies “make friends with creatures” on the basis of the Legitimate Peripheral Participation theory by Jean Lave & Etienne Wenger, it has been made clear that the way of synergetic participation of teachers and children will change on the occurrence of “conflict” and subsequently teaching materials will develop.