Golden Sky Stories is a heck of a game.
It was my first introduction to the Japanese trpg scene and it completely re-aligned my own approach to design, so this is going to be less of an objective review than usual, but I heartily recommend checking this out.
The PDF is 146 pages, with wonderful, charming, super expressive illustrations peppered heavily throughout the book.
Flavor-wise, Golden Sky goes for a cozy, pastoral tone. You play as shapeshifting animal gods in a small, rural town, and most of your adventures are just...doing nice things for people. Maybe there's a little mystery or suspense, or a moment of conflict, but it's your ability to repair relationships and solve disagreements that makes everything right in the end, not bonking each other on the head with swords.
Golden Sky isn't really built around pvp or combat, and its engine is dead simple. You have static numbers for skills, and if your number meets or exceeds the TN for a check, you succeed. If it doesn't, you can spend points from a limited pool to succeed anyway. Your pool refreshes periodically, and you can increase its size by levelling up your relationships with people.
Golden Sky's standout feature is its relationship mechanic. Anyone, at any time, can give anyone else exp. Usually it's for good roleplaying or doing something cute, not for progressing the adventure. With exp, you can strengthen relationships. The stronger your relationships are (and the stronger other people's feelings towards you are) the more points you have to pass checks or to activate unique powers based on your class.
Golden Sky is surprisingly class-based, but there's a lot of room to differentiate characters within each class. You could have several bird-henge or cat-henge in a party, all of which feel completely different, and class supernatural powers are often tied to fun drawbacks. Nothing feels punishing or "I have to take this to be viable." Just building a character is a treat.
If I have to critique Golden Sky Stories for something, it's that the sample scenarios it comes with have very little tension in them. There's a *lot* of good hooks in the town and npc section, but the scenarios themselves might not have enough going on to engage a group that hasn't played anything like this before. Supplemental material (such as Colors Of The Sky and Twilight Tales) helps patch this, but I recommend homebrewing your own custom scenario to start.
Overall, if you like cozy games, if you want something to play with a younger audience, if you want to check out some extremely high production values, and if you want to see a little bit of what the jtrpg scene has to offer, I strongly suggest snapping up a copy of Golden Sky Stories.