"Hooray! Now I'm a schoolchild!" makes you excited for school, new friends, and exciting challenges: How exciting, today is Kim's first day of school! She's barely arrived when things get hectic. Together with the mismatched twins Pop and Carlchen, Kim makes a mysterious discovery: Bo, the cheeky blackboard ghost, has gotten lost, and the three friends absolutely have to get him back to his blackboard. Easier said than done—after all, nobody must find out about their secret…