These short series ... are an oddball. Like they're based off from games, made from Falcom, which is kind of obscure developer in the West, but respected on the East. Their games were, and still are, quite innovative for it's time, having great soundtrack, enjoyable and relateable characters, and interesting plotlines.
These series takes the chance to joke and goof around, hyperbolizing the behaviour of these said characters, or poking at their strange quirks. The gags vary in execution, but in general it's an enjoying and satisfying watch, BUT ... in order to get them you need to know some major knowledge
of the games involved ... varying from random, often useless knowledge conceriing the game's lore or straight up jokes from the fan community, which basically means you have to be dedicated fan of either Trails in the Sky, or the Ys games, and preferrably to both, so you can safely say that show appeals to really small niche of people. In order to ease the fans of the developers, I'd like to include a list of the referenced games, which may help you figure out if you actually played a game from these series, or even better, to guide your attention to these two franchises, which are totally worth everyone's time, in my personal opinion. From Trails in the Sky - First, Second and Third Chapter, as well as Blue and Zero Kiseki, and from Ys - I and II, III (Oath in Felghana), IV (Memories in Celceta), as well as Seven.
To say that these series are not for everyone is an understatement, since this show is only aimed towards the dedicated fans of this franchise and is not really inclusive enough for non-initiated watches, who can honestly feel they're losing their time with this show, and I would get them. For the very few who actually are fans in some way, I do think you'll enjoy your time.