Tetsuji’s listless high school days take an abrupt turn when his imposing elder sister, Mao, known as Maou a.k.a. the Demon King, returns home. Despite his own large stature, timid Tetsuji faces an unexpectedly sad yet fiery summer with the towering 188cm Mao.

After quitting baseball due to a past incident, Tetsuji finds his quiet high school routine shattered by his married elder sister, Mao. She stands at an intimidating 188cm, earning her the nickname Maou, or Demon King, and casts a formidable shadow.

Though big-sized himself, Tetsuji is the timid opposite of his sister, who is "huge in many ways." Their summer holiday together is set to unravel with a blend of comedy, drama, and romance, exploring their challenging sibling dynamic.

Read Maou No Kikan manga. Timid Tetsuji’s life is upended when his 188cm tall, 'Demon King' sister Mao returns, sparking a fiery summer.

Maou No Kikan, Tetsuji, Mao, Demon King, Slice of Life, Comedy, Drama, Romance, Siblings, Read manga online