Yusuke begins a private tutoring arrangement with Reina, whose striking presence quickly makes the sessions anything but routine. At her home, he soon meets her mother, an older woman experiencing a personal crisis who directs her considerable charms toward the young man as well. When the mother interrupts an intimate moment between the pair, a spirited rivalry erupts as both women compete to win Yusuke's undivided attention. Caught between their determined advances, he finds himself at the center of an escalating contest of affection.