'Im Dajun', who was abandoned at home and lives as the leader of a runaway family. One day, 'Yeonwoo', whom he accidentally brought home, causes a violent incident with a knife in Incheon. Standing in the way of 'Yeonwoo', who was trying to kill a chaebol chairman for revenge, is 'Yoon Gamin', the strongest boy who dreams of being the best student. Meanwhile, 'Na Hwajin' from the Education Protection Bureau finds the situation interesting... The first crossover in the Blue String Universe! A grand clash between the main characters of Get Schooled, Study Group, and To Not Die! This is a record of a fierce battle not covered in their stories.