Wednesday Disappears [Indonesian]

He looks like a normal and well-adjusted young man who is no different than anyone else. There is not a reason for anyone to suspect this man is different or suffers from an internal rage. he, however, harbours no less than seven different personalities. There is a rhyme to this idiosyncrasy however. The man's seven personalities appear according to which day of the week it is. The personalities know and study one another. The man keeps a diary.