Simply Amazing. Hilarious. Funny. Enjoyable.
Add ons rarely have a story but usually just show your favorite characters in a fun fashion you have not yet seen in.
That is what this OVA does. The characters are able to do insane things, in the form of a story. If you liked the original series you will probably like this too.
Conclusion: You should definitely watch this for comedy, mindless fun and easy to get jokes. Also it is just fun to watch how the characters interact and overreact and their way of teamwork.
