In Japan 100 years ago, the only way to communicate with families living far away was through post or telegram, meaning we could not get there immediately in case of emergency. On the other hand, communicating through the written word sometimes allows for messages that are more honest and heartfelt than normal conversation, playing an important role for families and friendships. But since the middle of the 20005, Internet and mobile phones have been on the rise and SNS too since 2010. While convenient, it can sometimes be dangerous too. Enjoy the progression of communication tools over 100 years through the eyes of children.