It could imply that the person has a story where they feel a sense of sadness or self-pity. Maybe they've gone through tough times and are now ready to talk about it.
I'm not sure if 'the senpai a seinfeld visual novel' is popular. Since I haven't heard much about it, it may not be widely known or it could be a relatively new release that hasn't gained a large following yet.
It could be about the relationship between the protagonist and their senpai. Maybe it involves the daily interactions, the growth of their bond, and some emotional experiences like friendship or a budding romance.