Don't toy with me Nagataro san is my favorite manga oat. Honestly, I'm tearing up as I'm writing this. At first I started reading it because of a Youtube fan edit I saw, and was kind of in an ecchi/romance phase. But as I kept reading, I truly got to see two people evolve and grow with each other to help them achieve their goals. This completely changed my view on what love is and should be honestly. Even though it started as just harmless teasing, Nagatoro truly began to be more aware of Senpai's presence past his cowardice. She saw his passion in his art, and pushed him to achieve the greater lengths he sought out, as kind of a reflection of herself. Naoto also did the same for her, reigniting her passion for a hobby she had once given up on out of a lack of her own self-worth. Everytime I read this crap I realize how wholesome it really is, especially with the asides in the beginning where Nagatoro wonders if she's being too harsh at times with the teasingThe exploitation of his weakness to her is both fun, and a kind of coping mechanism to distract herself from her own weakness within. But as he grows stronger, he helps her do so as well, which is why in the middle and end there is much less severe teasing and much more wholesome banter and connections. This manga shows how love isn't about having set roles in a relationship, or having a certain concrete dynamic, or sharing similar hobbies and/pr activities together. Love is about caring about someone, and having the ability to grow with them as life goes on. It's a great comedy too honestly, at times making me actually laugh genuinely at the antics the two get to (might just be my fat chud humor though idk).

Art:
The art is really good at times. I don't wanna get too in depth, since it's an ecchi and I don't wanna sound like a perv describing the panels, but you can feel the intimacy and emotions radiating off of each of the characters. For what it is 9/10.
Characters:
Since this is a slice of life, obviously the character cast carries the manga. The manga mainly focuses on Senpai and Nagataro, but they both have so much depth in their passions and weaknesses it's refreshing and exhilerating watching them get over them. 10/10
Story:
It's not really linear, and since it's a slice of life it's more just boundless antics until a certain arc happens. Before the end the author gets a tad bit too horny for his britches and it takes away from the main romance, albeit only for like a few scenes. 8/10
Enjoyment:
10/10. It's a wholesome hot ecchi, what's there not to enjoy?

I read this in the beginning of high school (and thank god I did or I'd feel like a weirdo perv reading it), and even now I've come to conclusion that this is one of the suggestive romances ever, and my favorite manga ever. 100/10, I don't think anything is ever topping this for me. (Especially not Chainsaw Man with that trashahh ending)

This manga is a golden trashbag.
Gantz starts out as a gritty dark humor about being recruited to a gruesome difficult war after death, and then somehow starts to create branching storylines of the stupidest most random unexplained crap ever. This manga is just like advanced grade ecchi slop with few good arcs. The main storyline and premise is completely wasted on this trash.

Art: The art is perfect. In every panel, the characters are drawn perfectly, the weapons and suits have this sci-fi-esque aura about them, and the aliens are absolutely terrifying beasts. The alien designs and drawings invoked fear in me every time they were on screen. The gore is grotesque and brutal, and I'd rate the art as a solid 10/10 with one exception. The author is just like a rampaging pervert. Like, there's a period of reading where every chapter opens with a half naked, or fully naked, random girl that sometimes has nothing to do with the plot. There were moments where I was confused if I'd missed a few chapters or something because the random gooner bait beginning every chapter just started to become completely unrelated to the plot. Art was still good though. 8/10

Characters: Only the guy characters are given any depth or writing. The writing of them can be very superficial at times, but the more in depth themes involving some of the main cast is very compelling at times. On the other hand, there's a lot of fodder characters with no writing at all. In the beginning, the author at least tried to give the extra characters some depth and overall character and personality, but as soon as you go deeper a lot of the extras are just... perverts and rapists? You never really get attached to the extra cast as well, since the manga really makes sure to make it apparent that they are disposal. Also, all the girls are just like, nothingburgers. Besides Tae, no girls have there own arcs or personality or literally anything like actually genuine (there's one other person who does, but she sucks and I'm not bringing her up until spoilers). 5/10

Story: The story is super duper good, in a vacuum. The main premise of an after death war where your recruited to find and kill horrifying aliens is a golden premise, but for some reason the mangaka felt the need to add a whole lot of B.S. in between. No spoilers, but some of the plot lines are so fudging random it doesn't make any sense at all. Some just aren't explained and are all added for no reason. It's hard to explain without spoilers, but there are just random stuff that are pimpled ontop of the main plot. 6/10

Enjoyment: Missions arcs were very enjoyable, and some of the school conflicts were as well, but everything else is just kind of trash. Especially the side plot of the final arc, it's so fudging stupid. I still enjoyed it though. Besides the random half naked girls everywhere like what the hell. 5/10

Spoiler warning, these are the few things that really make this manga suck for me honestly.
I don't know what the mangaka was thinking when he made Reika, the random famous perfect model girl with everything she wanted in life, fall madly in love with the MINOR main character (after one mission together btw). I thought, "Hey, Kei (MC) is loyal to Tae (MC's girlfriend
), so I wonder where this plot line will go. Really hoping author doesn't make them break up or anything just so Kei can get with Reika!" Thank god that didn't happen. Instead, Reika cloned Kei against his will so the clone would be for her and her alone. Like genuienly. There's literally only 1 or 2 chapters actually talking about how she just cloned Kei, and when the Cloned Kei goes to vent to the normal Kei, normal Kei literally says "That's perfect! Now you can date Reika! Lucky guy." Like what!?!?! Cloned Kei is obviously still in love with Tae, his actual girlfriend, but Reika is pretty much just like "Well, you can't have her cause real Kei does." So now, pedophile Reika has her own personal relationship slave cloned Kei for the rest of the manga without any repercussions.
Also, the Gantz American team has a literal rapist on it. The line which introduces him is, "That guy will rape anything, human or alien." Like, what? The manga goes in detail how the aliens aren't monsters, but like genuine intelligent life. They are literally called immigrants by the Gantz ball. So, I genuinely don't know why this alien AND human rapists is just like alive. He doesn't even die. He just shows up and rapes aliens and walks away scott free. No like symbolism or commentary behind it either. Like what was the point?
Also, the author adds these random mysterious nanodroid vampires who are never explained and just die. They're there for multiple arcs, watching in the background and at times attacking the main cast as well, but their are no missions actually after them specifically. They just show up, have aura, cause chaos, then disappear. They aren't even explained to be aliens or anything.
Also, 2 of the main casts develop telekinesis? Also unexplained. It's completely unrelated to the aliens as well. Before they're even transported into Gantz and are just normal humans, they just learn and use telekinesis. Not explained either.
Final arc was actually really good, and in the final final part of the manga, Reika and Clone meet like, a literal god. Not even the real Kei gets to meet this higher being that caused all of the manga, no just Reika and the clone Kei. Higher being is telling them how this was all random, how their may or may not be an after life, and how nothing matters. Then, for some reason, Reika gets really mad and literally attacks god. For no reason. Surprise surprise, she gets exploded into mist. So, clone Kei is finally free! Right? Right?! Nope. Clone Kei gets mad as well and also attacks literal god, and gets turned into mist. Wow, how compelling! Then, after the main cast, (excluding Kei and Tae because their back on earth safe) has met literal god, their is another battle to save the world. With just a random alien who's been in two fights. This is the final fight. With random alien soldier man. What's the point? Like actually?
All of the girls have horrible writing and are used mainly as goon bait. I genuinely can't think of one girl who wasn't almost raped, raped, groped, or shown half naked in the whole manga. Tae is the only one with almost a semblance of character, and is actually a person with feelings and emotions. Everyone else is just, brainless extensions of the guys of the main cast. The second main girl introduced in one of the missions literally just has sex with Kei WHILE THE MISSION IS STARTING! WHEN THEY JUST MET. The first girl introduced in the manga is naked, and sexually harassed by a dog. In the first like 5 chapters. She's also threatened to be raped in the first 5 chapters as well. It's honestly just so disgusting how they're written I can't look past that. Multiple times I wanted to just drop the manga because I felt like I was reading a rape fantasy.
Lastly, the random naked women at the beginning of every chapter really really breaks immersion honestly. Like, I get it mangaka your a pervert. But why am I being flashed for almost every chapter for no reason? Go draw a hentai man.

Overall
Pros:
Amazing art designs for the aliens and sci-fi elements.
Some very compelling characters and story arcs
Mission arcs are always done really well.
Cons:
You're being flashed the first page of every chapter.
All the girls are goonbait for no reason, with no good writing.
There's so much needless rape-bait and rape with no commentary or symbolism besides just showing rape.

3/10 MAX. Can't recommend this to anyone honestly. Just go watch Gantz:0 and leave it at that.