I ran across this randomly browsing various older OVAS and it is very interesting. A fun watch with great art, music, and voice acting (sub)- but the most ridiculous script I've seen in a while. It's absolutely worth spending the 45 minute run time on. Art: 8/10. Very solid with some incredibly fluid and beautiful animation, reminiscent of Urusei Yatsura. Some of the character art seems a little off and some of it feels out of place for reasons I'll get into, but the lighting, backgrounds, everything is really incredible. I did not expect to see realistic art of a helicopter cockpit, beautiful nature scenes, incrediblescenes of japan circa 1900, very fluid action sequences, etc. in this but here we are. Feels like the animator/animators really wanted to experiment and showcase their ability- absolutely a passion project in this regard. The pacing and art is pretty wonky at times, but the effort in some scenes more than made up for it for me.
Music: 6/10. Not breathtaking but very solid, matches the visuals quite well (at least what you can hear when you aren't screaming and laughing). i really like the cute outro song especially. Sound effects also generally are appropriate and often pretty realistic.
Voice Acting: 8/10. The performances are generally really good, especially Yuno's voice actress who delivers some great performances. In particular, when Rokuro is kidnapped it is especially emotional and raw.
Characters: This is where we get into the weird shit. I'm gonna give it a 7 i think just for the absurdity of it all, but it is very hard to rate. They are generally very consistent (except for Rokuro at the end) but the interactions are not realistic at all to a fantastic degree. everyone is absolutely insane and obsessed with weird sexual kinks to the extent that it's basically their entire character (but it is an incredibly wealthy family so ig those kinds of folks do tend to be very weird?)... I think it's all very silly though, the overall feeling of this anime I find to not be horny at all due to the insane characters and plot.
Plot... oh god. 1/10 and 10/10 simultaneously- absolutely so bad it's good. stuff just kinda happens, I don't think i can properly describe the insanity here. There's romantic scenes, intense action scenes with helicopters and tanks, rich family drama, a lesbian dominatrix trying to train Yuno's pussy strength in a sex dungeon... it has everything you could ever (never?) want and it's perfect. It doesn't take itself too seriously and you shouldn't either. Just sit back and enjoy the ride.

Overall: easily an 8 based on enjoyment alone, maybe even a 9- but the first three categories I wrote on are genuinely quite good. You'll be in awe at the visuals and in tears at the plot- and it's some of the best laughs I've had in ages.
Watch it with a friend. You won't regret it.