By the Command of the Hellish Sister

Some animated projects are intended for viewing exclusively by adults. But that does not mean they are any less popular. Quite the opposite. And this becomes clear after reviewing the ratings of the anime By the Command of the Hellish Sister Season 3, the release date of which is still kept under strict secrecy.
Plot of the series
Basara is quite satisfied with his life. He considers himself an ordinary teenager destined for a wonderful future. The only thing that bothers him is his father's loneliness. The man is a widower and categorically refuses to consider the option of remarrying. And the boy did not want to remain the only child in the family. He always hoped that he would have a sister to take care of. But the more the boy persuaded his father, the angrier the latter became. Soon the young man realized that such conversations were completely useless. And so he stopped any attempts to persuade his relative to give up the forced solitude that he had imposed on himself.
How surprised the boy was when his relative informed him of his intention to marry again. Of course, this was a rather unexpected decision. Since just a few months ago he did not want to hear anything about it, and now suddenly he had changed drastically. Moreover, the man informed his son that he would now have two stepsisters. After all, his beloved has two daughters from her first marriage, whom they will now raise together. The meeting with the new relatives happened spontaneously, so the teenager could not properly prepare and somehow control his emotions.
The father's imminent departure was just as unexpected news. He announced that he intended to go to another country to help his chosen one finish her current affairs. And so Basara would have to look after his relatives during this time. Of course, this was extremely strange. But there was nothing he could do, so he had to come to terms with it. The boy's adventures did not end there. It turned out that these girls were not actually human. One of them is a succubus, and the other is a demon lord. They came to Earth to hide from their enemies. And they considered the hero's house to be the safest place.
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Only they could not expect that this boy would also turn out to be not so simple. After all, he is actually a protector of humanity. In the past, he was part of the "Heroes" squad. They were all excellent warriors who perfectly wielded the immense power contained in their weapons. But over time, Basara realized that he no longer wanted to risk his life. That is why he completely stepped away from affairs. No one could expect that one day he would have to take up his weapon again. And not at all to help his clan brothers capture and then kill the demon lord. By a ridiculous coincidence, these two enter into a contract. According to its terms, the schoolboy must become a protector for this princess from the shadow world. And so he will have to stand against those he once considered his comrades.
Main characters
Basara Tozase – he only seems like a simpleton who knows nothing about life. In reality, the boy is a renowned warrior.
Mio Naruse – the daughter of the demon world lord, who has inherited his power. And therefore, she is now being hunted.
Maria Naruse – a beautiful girl who is a succubus. She uses her charms to join her mistress in the Tozase family.
Yuki Nonaka – the hero's childhood friend, whom he has not seen for quite some time, as she was also exiled.
Kurumi Nonaka – Yuki's younger sister, who was distrustful of her friend but later fell in love with him.
Rukia – a relative of Maria, subordinate to the forces of darkness.