9th Period 'Collarbone' / 10th Period 'Library Room' / 11th Period 'Lifting Skirts' / 12th Period 'Experiment'

Following the line of the precedent OVAs (of the same name) This anime goes around the normal lives of some elementary school (5th grade, 2nd class room) kids and their adventures, while turning to teens. Their games, stupid jokes, and the misunderstandings ar...