It's likely a visual novel related to the 'Nanbaka' series. It might include the unique characters, settings, and storylines from the original 'Nanbaka' work, perhaps with interactive elements and different plot branches for players to explore.
It might also be a term of endearment for a younger male friend or acquaintance. In some groups, people use 'brother' in a friendly way, and 'little brother' could be a specific person within that group who is no longer interested in stories.
There's not enough information to say exactly who the little brother is. He could be an ordinary boy in a family who is the youngest among his siblings.
I think you could also try searching on Wattpad. There might be some interesting Nanbaka female Jyugo fanfics there. Look for ones with high ratings and a good number of reads. It's a great way to find stories that are popular among the fan community. Maybe you'll find a fanfic that delves into a unique adventure or a heart - warming friendship involving the character.
Overall, Nanbaka Season 2 adheres closely to the manga. There are a few minor tweaks for better adaptation to the animation format, but they don't deviate significantly from the original story.
In the novel, Ye Xiu was a male. He didn't have a brother or a sister.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
You can try looking for it on official gaming platforms like Steam. Sometimes, visual novels are also available on the official websites of the developers or publishers.