In the anime Highschool DXD, the "DXD" stands for "Dragon of Dragon." This refers to the main character, Issei Hyoudou, who becomes a servant of a high-ranking devil and is known as the "Red Dragon Emperor." The "DXD" also represents the various supernatural creatures and factions that are featured in the series, such as devils, angels, and fallen angels. **

In the anime Highschool DxD, DXD stands for "Devil" (D×D). The title is a play on words, as the "D" in DXD can also be interpreted as the Roman numeral for 10, making it "Double D" and referencing the protagonist Issei Hyoudou's aspirations to become a powerful devil. **

"Highschool DxD" is the first season of the anime series, while "Highschool DxD Born" is the third season. The main difference between the two is that "Highschool DxD Born" continues the story from where the first season left off, introducing new characters and plot developments. Additionally, "Highschool DxD Born" delves deeper into the supernatural world and the conflicts surrounding the protagonist, Issei Hyoudou. **

The second Highschool DxD light novel, titled "Highschool DxD Volume 2: The Dark Knight of the Sunny-spot," continues the story of Issei Hyoudou, a high school student who is also a member of the Occult Research Club and a devil. In this volume, Issei faces new challenges and battles as he continues to navigate the world of devils, angels, and fallen angels. The novel delves deeper into the supernatural world, introduces new characters, and explores the relationships between the main characters. **

Highschool DxD Season 1 and 2 follows the story of Issei Hyoudou, a high school student who is killed by a fallen angel but is revived as a devil by a beautiful senior student named Rias Gremory. Issei becomes a member of Rias' devil family and joins the Occult Research Club, where he must navigate the dangerous world of angels, fallen angels, and other devils while also dealing with his newfound powers and the challenges of high school life. The series features a mix of action, comedy, and ecchi elements, with a focus on Issei's growth as a devil and his relationships with the other characters. **

No, Highschool DxD is not finished. The light novel series, written by Ichiei Ishibumi and illustrated by Miyama-Zero, is still ongoing with new volumes being released. The anime adaptation of the series has also seen multiple seasons and OVAs, with the possibility of more in the future. So, fans can look forward to more content from the Highschool DxD series. **

Highschool DxD ends with the main character, Issei Hyoudou, continuing to grow stronger and facing various challenges as a devil. The series concludes with Issei becoming a powerful and respected figure in the demon world, and he ultimately achieves his goal of becoming a Harem King. The final scenes show Issei and his friends continuing their adventures and facing new enemies together. **

Highschool DxD continues with the protagonist, Issei Hyoudou, continuing to navigate the world of angels, demons, and fallen angels as a member of the Occult Research Club. The series delves deeper into the conflicts and power struggles between the different factions, while also exploring Issei's growth as a character and his relationships with the various female characters. The story also continues to feature intense battles, comedic moments, and fan service, maintaining the blend of action, romance, and ecchi elements that the series is known for. **