Professor Seligman, the founder of positive psychology, wrote down three good things (good, happy, happy, etc.) every day before going to bed for a week, and after that, it took about six months. announced results of increased happiness and decreased depression.In addition, you can expect effects such as "becoming positive and positive about things" and "improving the quality of sleep".★You can use it for free.★We will inform you at your favorite time with the notification function.★You can share the diary you wrote with the share function on LINE, Twitter, etc.★Photos can be attached to the diary. Lets write a good thing with an image.★Transparent design like frosted glass beautifully colors the background with gradations and effects.★Various gradations and effects can be changed.★You can easily look back on past diaries with the search function.★Various fonts are available, from casual and formal to unusual.★ Data can be backed up and restored. If you back up to GoogleDrive, etc., you can continue to use it even if you buy a new smartphone.