[Crossover] Association for the Protection of Minors' Mental Health

"Hi there! I'm your Guardian Sweetheart. Just call me Red. Besides me, you have two other Guardian Sweethearts: Jay, 'Literature,' and Nepal, 'Robin.'"

Along with a meteor shower, a strange new power system appeared in the world.

Children who had not yet come of age began to manifest wondrous guardian spirits. Only children could see and talk to them.

The spirits sent every child on a marathon through life, urging them to keep running toward their dreams.

But the guardian spirits were not the only ones to appear. There were also "Bad Guys" and villains who tried to destroy the track.

The Guardians, wielding "Locks" and "Keys," bore the mission of protecting the mental health of minors.

Theme: Growing up alongside wondrous powers