*Beware The Spoilers... If there are any.*
Alright so GJ-bu revolves around the protagonist, Shinomiya Kyōya, who is forced to become a new member of the GJ-bu (lit. GJ Club), an unidentified club that dwells in a room of the former building of a certain school. There he meets four girls: Mao, Megumi, Shion and Kirara. Time flies with these unique girls around. The series follows the everyday, though unusual, antics of this band of friends.
Or so it says in the wiki which seems like an accurate summary of GJ-bu.
- In terms of Storyline, GJ-bu is quite boring. There nearly isn't any noticable drama nor storyline except for the everyday shenanigans the characters are involved in. However, while the storyline is overall kind of boring, it also had its great moments.
Also, while it is arguably boring when compared to other Slice of Life anime's I've watched, the story is quite realistic in term of potraying how boring, yet sometimes incredibly fun, school could be with the right people around you. If you're looking for a slow Slice of Life/Comedy anime without any heavy drama and etc, then I'll say that this show could be perfect for you.
- In terms of Animation, GJ-bu has a great animation. The effects, the way the anime was drawn and animated. I don't really know how to describe it, but I can tell you that GJ-bu has a great animation which would make it more enjoyable to watch.
- Sound, similar to animation, I don't think anyone would have a problem with it. The Seiyuu/Voice Actors and the producer have done a terrific job on it, just as great as the animaton.
- Now for the Characters, each of them have their own distinct typical personality, obviously. Putting Storyline aside, I'd say that the characters are funny, unique and enjoyable in their own ways. But like I mentioned before, they are still kind of boring since they lack any "great drama material" like "a dark past" or etc; they are all pretty normal when one think about it. However, despite the "boring" nature of the series, you can really feel the genuine happiness they share amongst each other as well as their strong bonds, like for example the scene where the GJ-bu seniors were graduating saddened me, but, like usual, Mao always found a way to cheer everyone up.
In conclusion, GJ-bu is a great anime for anyone that want to watch a "slow" slice of life/comedy series. The series has a great sound and animation, which I don't think will be a problem for anyone. Just don't expect any 'hard' drama or 'super funny' comedies and you won't have anything to be disappointed about.