Опасное лечение сексом

After attempting to commit suicide, elite office worker Katsuragi Makoto wakes up bound in an unfamiliar place. There he meets his captor, Yoden Ryuji, who forces a horrible life of sexual assault and confinement training on Makoto. The two start bonding and each begins to recall the tragic past that led them to this deranged situation.

(Source: MyDramaList)

~~ Adapted from the manga with the same title by Mizuta Yuki.