Ikumi No Himitsu
Consists of two separate storylines:
Tachibana Ikumi is a normal high school student. He is not very popular, is very lazy and weak. One day while being bullied a strange power awakens in him, and soon after a beautiful girl comes and tells him that he must learn how to control his power because his power is what will save the world.
Kuroda Ikumi seems like a normal underachieving high school student, however he is hiding a secret. He is actually the son of the King of the Spiritual World who is living among the humans to study them.