Saw the OVA
A pretty excellent adaptation of their trip being split with the serious event of the Kanzaki moment and then the gov't gun trying to take Kurosensei out with the addition of some downtime at the inn. Only slight issues were just things that could probably be resolved with a larger budget and a bit of some time adjusting to Kurosensei's voice. The colouring changes for him at moments and the brief moments of comedy were good highlights capturing the spirit of the manga, while Karma kun moments were the best things and all I wanted. His faces and such are hilarious.
2nd half was really entertaining, laughed quite a bit.
I hope someday it does get a full tv anime and such, baseball, the exams, and then the whole island/hotel arc would be amazing animated.