There's not enough information to determine its widespread popularity. However, if it has received positive reviews from players and critics in the visual novel genre, it could be gaining popularity. Some factors that can contribute to its popularity are interesting characters, a well - written plot, and appealing art style. If it lacks in these areas, it may not be very popular.
Since I don't have specific information about 'ano no kanata visual novel', it could potentially have a unique story set in a fictional world. Maybe it has elements of fantasy, like magic or otherworldly creatures. The characters could be on a quest, either literal like finding a hidden treasure, or more metaphorical like finding their place in the world. Visual novels often use beautiful art and music to enhance the storytelling experience, so this one might as well.
In general, it's always best to support the creators and the industry by using legal means to access light novels. This helps ensure that more great works like 'Kyoukai no Kanata' can be created in the future.
You can try some fanfiction websites like Archive of Our Own (AO3). There are often a lot of fan-created stories about different characters, including ones related to Light and Misa from Death Note. Just use the search function on the site and type in relevant keywords like 'Light Misa lemon' to see if there are any stories that match what you're looking for.
There are also some libraries that have digital collections. You could check if your local library has an e - lending service and if they have 'Kyoukai no Kanata' in their collection. Additionally, some fan - made websites might claim to have it for free, but be cautious as these might be illegal or have poor - quality translations.
In the fanfiction, their relationship could develop further by sharing their dreams and fears. Maybe one night, under the stars, they start opening up about what they are really afraid of and what they hope for in the future. This emotional vulnerability would create a stronger bond between them. Also, if they start to teach each other new skills, like Kanata teaching Miyu how to better control her UFO baby powers and vice versa, it would also enhance their relationship.