One common theme is the crossover of powers. For example, Naruto's ninja techniques might be combined with the Sailor Senshi's magical powers. It creates a new and exciting dynamic.
The story likely involves the Sailor Scouts using their powers to protect the world. There could be new magical items or transformations. Maybe they have to travel to different realms to fight the new threats. It also might explore more of their backstories and how they became the Sailor Guardians in the first place.
Love and loyalty are also big themes. The Sailor Senshi are extremely loyal to Usagi, and there are often undertones of platonic love in their relationships. They would sacrifice a great deal for her, and this is explored in many different ways in various fanfictions, like one where a Senshi risks her life to save Usagi from a powerful dark force.
Another great one is 'Naruto's Sailor Moon Adventure'. It's a fun read where Naruto somehow gets involved in the Sailor Moon's battles and quests. The author does a great job of mixing the two storylines, and the character development of Naruto within the context of the Sailor Moon world is quite engaging.
One great 'Sailor Moon Senshi x Usagi' fanfiction is 'The Bond Beyond the Stars'. It beautifully explores the deep connection between the Sailor Senshi and Usagi. The story has some really heart - warming moments where their relationships are tested and strengthened.
A major theme is adaptation. Harry has to adapt to a whole new set of rules and abilities as a senshi. This includes learning about the senshi world, its hierarchy, and how his magic as a wizard interacts with his senshi powers. There's also the theme of self - discovery as he figures out how this new part of himself fits into his overall being and his place in the world.
It depends on the plot of the fanfiction, but Hinata could also be a main character in a Naruto Outer Senshi story. Her shy but strong - willed nature could be developed further when she meets the Outer Senshi. Maybe she gets some special powers from them or has to help them understand the Naruto world better. And of course, Sailor Neptune, with her elegance and powers, would be a central figure in the story as well. Their relationship could be one of mentorship or friendship, which would add depth to the story.
I'm not entirely sure as I haven't experienced this visual novel specifically. But generally, a visual novel often has a story line involving characters. Maybe it's about female warriors with some unique characteristics, like in many visual novels where there are adventures, relationships, and challenges that the characters face.