I'm sorry, but your son... the results of his academic test did not meet the passing criteria for our school..." At the entrance briefing for her beloved son scheduled for next spring, the virtuous guardian mother "Rin" was unexpectedly told this by a male teacher in charge. The protective mother, dismayed about her child's future. "However, madam... our school has a special admission category... what is commonly referred to as a backdoor entrance..." "Depending on your stockings, madam... your son's admission might be possible...