Yes, there might be. There are a vast number of fanfictions out there for various combinations of popular culture elements. Since Highschool DxD has a large fan base and Godzilla is an iconic figure, it's not unlikely that some creative fans have combined the two in a fanfiction. You can try searching on popular fanfiction websites to find such works.
One common theme is power. Godzilla is extremely powerful, and in the DxD universe which also has powerful characters, exploring how his power compares and interacts is a big theme.
Godzilla could be a new kind of threat that the characters have to deal with. Since Highschool DxD has a lot of supernatural elements already, Godzilla could be seen as an even greater supernatural force. It could be that a dark magic spell accidentally brought Godzilla into their world.
Well, in some fanfictions, Godzilla's presence in the Highschool DxD universe might disrupt the power balance. For example, Godzilla's atomic breath could be a huge threat to the various factions in Highschool DxD. Some fanfictions might explore how the characters adapt to this new and extremely powerful entity. They might try to find a way to communicate with Godzilla, like using magic spells or special artifacts to bridge the communication gap between them and the giant lizard.
One idea could be that Issei is a huge Godzilla fan and he finds an ancient relic related to Godzilla. This relic starts to influence his abilities and his relationships in the Highschool DxD universe. For example, it could make him more aggressive in fights but also attract the attention of some powerful and mysterious beings who also have an interest in the relic.
One great 'godzilla dxd fanfiction' story is 'Godzilla in the DxD World'. It combines the epicness of Godzilla with the unique elements of the DxD universe in an interesting way. The story has some really cool fight scenes where Godzilla's power is shown off against the various DxD creatures.
Godzilla 2002 was a Japanese movie directed by Masaaki Tezuka. It was also known as Godzilla vs Mechanical Godzilla. This sci-fi film told the story of the monster Godzilla reappearing in Japan and destroying the mechanical Godzilla to protect the Earth. The film was released in 2002 and was 88 minutes long. The main actors included Yumiko and Nobuno Itaka. According to Douban's rating, the movie received a good 6.8 points.
Godzilla 1998 was a 1998 American monster movie directed by Roland Emmerich. The film was quite different from the original Godzilla in terms of appearance and ability, and was considered disrespectful to the original Godzilla. It turned Godzilla into a fish-eating dinosaur and was eventually killed by humans with an airplane. This ending was difficult for fans around the world to accept. The film was controversial and was considered a failure.
We can get the following answer: Godzilla-1.0 is a memorial work to celebrate the 70th anniversary of Godzilla's birth, and it is also Toho's 30th Godzilla masterpiece. The story was set in Japan after World War II. The appearance of Godzilla brought more trouble to Japan, which had already lost everything. The movie was directed by Takashi Yamazaki, and the cast included Takanosuke Kamiki, Miyami Hamabe, Yuki Yamada, and others. The movie will be released in Japan on November 3, 2023.
Godzilla's 1998 version was a controversial movie. This movie was too different from the original Godzilla in terms of appearance and ability, and was considered disrespectful to the original Godzilla. It turned Godzilla into a fish-eating dinosaur and was eventually killed by humans with an airplane. This ending was difficult for fans around the world to accept. In addition, the film was also criticized for promoting warism, which was contrary to the anti-war and anti-nuclear demands represented by Godzilla. Although the film had some well-designed details in special effects and plot, it did not succeed in conveying Godzilla's majesty and disastrous atmosphere. As a result, Godzilla's 1998 version was considered a failure by both film fans and critics.