Kako

Kako (カコ / 過去, Kako) is a character who appears in Jibaku Shounen Hanako-kun. He is a supernatural who controls the past as one of the three Clock Keepers, along with Mirai and Akane, thus they are members of the Seven Mysteries. He is also the oldest and most powerful among them, also having the power to change a whole timeline other than just the past.