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The main character is Issei Hyoudou. He's a key figure in the story with his unique abilities.
The content of the 13th volume of the novel " Demon High DxD " was as follows: In the third chapter," The Lost Glory," the protagonist, Armstrong, and his companions came to a mysterious ruin and found the legendary Demon Sword. This sword has a powerful force that can give the wielder a powerful ability. However, this sword also had a dangerous weakness. Once it was attacked, the wielder's body would fall into a deep sleep and wait for the next awakening. In order to obtain the Devil's Sword, Armstrong and his companions engaged in a fierce battle. In this battle, not only did they have to face powerful demons, but they also had to face their own fears and uneasiness. In the end, Armstrong and his companions defeated the Devil's Sword, but they also realized that this battle would not end so easily. They needed to continue fighting until they achieved true victory. In the fourth chapter," The Power of Darkness," Armstrong and his companions began to explore the depths of the ruins and found a mysterious cave. In this cave, they found a huge demon waiting for them. In the end, Armstrong and his companions engaged in a fierce battle with the demons. In this battle, not only did they have to face the powerful strength of the demons, but they also had to face their own fears and uneasiness. Through this battle, Armstrong and his companions became stronger and understood themselves better. They decided to continue exploring the ruins in search of more treasures and secrets until they achieved true victory.
One of the main themes is the supernatural world. It involves devils, angels, and other mythical beings. Another theme is the growth of the protagonist, Issei Hyoudou. He starts as a perverted high school student but gradually becomes stronger and more responsible.
There are other characters like Sirzechs Lucifer, the powerful devil king. Grayfia Lucifuge, his queen. And Michael, the archangel. Their actions and decisions often impact the overall plot, especially in terms of the power balance between the different supernatural factions in the story.
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I'm not sure specifically as I haven't read Volume 23 yet. But generally, in the High School DxD series, we can expect more development of the characters, new supernatural elements, and exciting battles between different factions.
I don't think it's a good idea for a newcomer to start with Volume 23. It's better to start from the beginning to understand the characters, the world - building, and the basic plotlines.
We can expect more exciting adventures of the characters. There might be new power-ups, more intense battles, and deeper exploration of the relationships between the characters.
When the Great Way is implemented, the world is shared by all people. elect people of high moral character and integrity, and cultivate an atmosphere of harmony. Therefore, people should not only support their parents, but also raise their children. They should make sure that the elderly can live out their days, the middle-aged can contribute to society, and the young can grow up smoothly. They should make sure that the elderly who have no wives, the elderly who have no husbands, the young who have lost their fathers, the elderly who have no children, and the disabled can all be supported. Men had their duties, and women had their homes. People hate to throw things on the ground, but they don't have to keep them for themselves. People are willing to do their best for the public, not necessarily for their own personal gain. Therefore, evil schemes would not happen, theft, rebellion, and harm would not happen, so the door would not be closed. This was called an ideal society.