Ikumi No Himitsu

Two distinct narratives follow characters with similar names. In the first, a high school student known for being unpopular, lazy, and weak experiences a sudden awakening of an unusual power after an incident of bullying. Shortly after, a beautiful girl appears and informs him that mastering this power is essential, as it holds the key to saving the world. In the second, another high school student who appears to be an underachiever conceals a hidden truth—he is the son of the King of the Spiritual World and is living among humans to observe them.