Well, without more information, it's hard to say precisely. Generally, visual novels can cover a wide range of themes. 'hara kano visual novel' could be about the experiences of its characters, maybe their personal growth, or it could center around a particular event or series of events that unfold in a fictional world. It may also incorporate different art styles and narrative devices typical of visual novels.
Well, 'photo kano visual novel' is probably a story - driven experience where the visual aspect is important, just like other visual novels. Maybe it has a unique art style to depict the world of photography. It could be about a young photographer's journey, his or her growth in the field of photography, and the relationships that are formed through the shared passion for photography.
A fanfiction might explore a scenario where Kido and Kano have to work together to face a new threat in Mekakucity. Kido's calm and collected nature could complement Kano's more mischievous but also resourceful personality. They might start off bickering but as the situation gets more serious, they realize how much they rely on each other and develop a newfound respect.
Since I don't have detailed knowledge of the 'photo kano visual novel', I can't give a definite answer. Generally, if it adheres to common standards of family - friendly content such as having a positive message, no inappropriate images or text, it could be suitable for all ages. However, some visual novels are designed with a more mature audience in mind, so it's important to look into reviews or more information about it.
One common theme is friendship development. Since they have different personalities, seeing how their friendship grows is a popular topic. For example, in many fanfics, they start as acquaintances and gradually become close friends.
Finding 'hara kano visual novel' could be a bit of a challenge. It may not be on mainstream gaming platforms. You could start by looking at specialized visual novel communities or forums. People there might be able to point you in the right direction, whether it's an independent website that distributes it or some other less - known source. It's also possible that it was only available in certain regions or at a specific time, so that could further complicate the search.
One theme could be trust. Since they are part of the Mekakucity Actors, they need to trust each other with their secrets and powers. A fanfiction could explore how they build that trust over time.
One common theme is the exploration of their unspoken feelings. Since they both have complex personalities in the Kagerou Project, fanfictions often focus on how they might be hiding their true emotions for each other.