Devil's pain

The story is called The Devil Who Suffer. The story is where a young devil named Akuma, who was a young boy with a lovely family and a big sister named Akane who were humans but loves Akuma. He had a childhood friend, Miyoko. But later, his family was killed by bandits. As Akuma started to snap and kill the bandits brutally. Years had passed, and Akuma was traveling with some adventurers, which Miyako and Akuma had promised to become adventurers together, but Miyako started to become distant to Akuma. She was an S rank, and you/Akuma were an S rank. Now you became a softie boy to a cold and ruthless man