IENE-967 - The bully from high school is my masseuse? Blackmailing her for sweet revenge!

I thought it would be an interesting project, but the 'delinquent' element didn't really add anything and it just ended flatly. I personally like Kimi no Shizuku, but the rest was mediocre. Was the delinquent theme even necessary? It would have been better if they kept it simple—just acquaintances where one blackmails the other into a trap.