Koishiki Kaikyuu

After graduating from college and passing the high level exams, Sgt. Akasaka enters the army and meets LP Oohori, a younger solider of a lower rank who is tasked with teaching Akasaka about his unit.

After Akasaka advises Oohori to take the army exam, Oohori reacts angrily and rapes him. However, for reasons unknown to Oohori, Akasaka doesn’t report the assault. From then on, Akasaka is repeatedly sexually assaulted by Oohori as “payment” for his lessons... but is the sex only a form of payment for Oohori or something more?