Hiiro, the sexy beauty, and cool technician named Shizuka, begin a physical love! Now they're the school's biggest (problematic) couple, making love when and where they please, even reaching the point of public training! The relationship keeps escalating. Where will it go?! 1. Kyoyou Hani (Range of Tolerance) After Shizuka sees Hiiro enter a hotel with another older man, he suspects that Hiiro is cheating. So he sets out to show to Hiiro just how forcefully loving he can be! 2. Kairaku Hani (Range of Pleasure) 3. Genkai Hani (Range of Boundaries) 4. Kyokugen Hani (Range of Limitations) 5. Rinkai Hani (Range of Criticality) 6. Shubi Hani (Range of Defense)