Maou no Kikan

Tetsuji left baseball after a traumatic event and has since drifted through high school without direction. His life changes when his older sister, Mao, returns home after being married. Standing 188cm tall, she is imposing and nicknamed Maou, or Demon King. Though Tetsuji is also large in stature, he is shy and lacks her boldness. The two are set to spend an intense and emotionally complex summer together.