Kono Subarashii Sekai ni Shukufuku wo! 3: Bonus Stage

As you can see in the page, it's 2 episodes OVA, but in truth it's a on movie compiling it having like a more or less 1hr duration.

The plot is literally like any OVA, so you can watch it without being preoccupied if you watch the whole series or not, though you need to at least know the main characters, Yun Yun and Wiz

I will resume a like in just some words but not literally, the imagination is for you guys.
The first is a "beach" episode and the second one is like the battle of two "protagonist's" group

If you watched at least any of ... the konosuba you know that you're going to laugh a lot

And then it's a spoiler but not a spoiler at the same time since it's just a notice that they give to us, and it's about Konosuba getting a new season!!!

Btw, this movie makes me like Wiz more than the others now, if you know what I mean after watching it lol

The 2 OVAs were entertaining. The second OVA definitely carried the first OVA.
Need to breakdown the OVAs -
OVA 1 - 7/10
It was funny with some fan service. Both parts equally average.
A beach episode with high buildup and less delivery.
The buildup wasn't as funny.
OVA 2 - 9/10
This was a cracker episode with Kazuma being the best.
It made the OVA series worth watching. Superb writing, animation and hilarious to the beat.
The new characters are well introduced and built up by the end.
...
Definitely watch the second OVA. Hilarious one episode OVA writing at its best.
A great respite for all Konosuba fans waiting for next season.

"Kazuma! Kazuma!"

"Hai, Kazuma Desu."

I will never get tired of hearing this little phrase when watching this series. Kazuma's little deadpan asides when talking to people are consistently the best part of the show. That, and Aqua finding a way to always pulling defeat from the jaws of victory.

Mini- Character Review

Kazuma - Dead Inside lol
Megumin - Cute, as always
... Aqua - Annoying as always, but in a good way
Darkness - Does sexy Darkness things

Watching these two OVAs just reminds me that we are a while away from the next season, but hopefully not as long as it was between the movie and Season 3. If Season 4 is a while away, hopefully they drop these enjoyable little nuggets for us along the way.

If you love KonoSuba, these episodes fit right in with the comedy you'd expect. Episode 2 is the better of the two episodes - I do have a soft spot for Megumin though, and episode 1 give her more screen time, which is not a bad thing.