Quick summary:

A hidden gem, lost in time. Despite being 38 years old, 11-nin Iru! is just as good as Knives out, Glass Onion, and beats a lot of new media in quality. 700 applicants divided into group of 10 take a series of hard tests to be admitted to Cosmo Academy. For their final test, they need to crew on a ship for 54 days - but to their surprise, there is 11 of them! And if it wasn't enough, one of them seems to know a little too much about the ship...

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Murder mystery...without the murder

Everyone loves murder mysteries. Someone dies in a place where escape isn't possible, so you know you are around a murdered 24/7. Thankfully, there is always someone who came to save the day, and finds the murderer, saving the day and others.
But have you ever thought about a murder mystery without the murder? 11 people, stranded on a spacer ship, needing, no having to pass their test find out there is one too many people. It's scary, they're not sure what to do - but they all know what their ultimate goal is. Finish the test and get into academy. So they try to work together... but there are those, that can't let their guard down.
And if you can't trust your teammates, how can you work in a team?

Dumbasses, dumbasses in love, and stupid biatches

The cast can be divided into three groups.
Dumbasses - a group of lovable but not very important characters.
Biatches - a group of little bitches that made this whole experience harder than necessary (not for the viewers, but themselves).
And dumbasses in love - that is my special little category of three people, Tada, Frol, Amazon.
I must say, it's been a while since I met cast this good. The "bad" guys are just immature little pricks, mostly King's butt-kissers. They seem to be besties, and just kind of let him take on the leader's role. Those who don't get much screen time still have fun little lines and great design.
And my best trio - Amazon who is ridiculous, Frol that got on my nerves sometimes and Tada who I kind of hate in a good way... They were all great.

Gay panic - but when you see a menir naked.

Spoiler, click to view

The love story between Frol and Tada was so awful I loved it. Frol was annoying Tada from the beginning, comparing them at everything because of Frol's need to be a good man. And when it seemed liek they will fail the test, Tada just casually asked Frol for their hand in marriage. Frol said yes, of course, and I swooned. Then when they found out they passes, Tada was so sad, the poor thing, because he thought Frol will want to become a man and won't marry him. But Frol said they still want to marry Tada!!!!
I am so normal about them....

When you annoy the hell out of your crewmate. but he is the first one you cling to when something goes wrong.Problem & more problems

You might think, thank God Tada is a telepath. Now he can tell us who is lying about being an applicant. Haha, no. All 11 of them seem to be real deals. Which means there is nothing they can do. Oh, yes. There is a button to call for help - but that would mean they all failed the test.
But this isn't their only problem. Around the ship - Esperanza - are Conductor vines. They are used for wiring, but they can also spread a Dell Red Spotted Fever - that is deadly.
You might think, thankfully they only cause fever at a high temperature... but what if, hypothetically, the temperature of the ship started to raise?
That's not all. Tada is a huge problem as well. Hearing voices, having visions... What is happening to him??

The "cringe" parts are incredibly funny

We're in year 1986. Of course some things will be incredibly funny. Just to name few:

Always showing his face to let us know which suit belongs to him. (Normally we just see black screen,) This dramatic blue lighting on the lower and upper screen. These close-ups.

Some things just aren't supposed to be funny, but they so are! Still, they're not bad. You get what I'm saying?

_ Manga and a sequel_

I read the manga prior to watching this movie. I prefer clean manga, which means I don't like a lot of text, bubbles, sparkles and too many pictures cramped on one page. Sometimes it's hard for me to read it.
But this one... I enjoyed a lot. I thought it was one of the best mangas I have ever read. I do recommend it to all the manga readers out there!
The adaptation was staying pretty true to the source. I was happy about that - I saw all my favorite moments animated. What I didn't find too amusing were the ending credits that told us the fate of the applicants after they passes the test.
Nevermind that!
Once you're done with the movie and the manga, you might find yourself wanting a little more... And thankfully there is a sequel. I didn't read it yet, but I am sure it will be okay!
What I wanted to say in this section is that it doesn't matter what media you enjoy more - 11-nin Iru! is for everyone and EVERYONE should give it a chance!

Conclusion: recommended <33