Saikyou no Shuzoku ga Ningen Datta Ken

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I finished reading the manga in two go. The review is based on how much I remember after two days.

It is fine. Lots of fan service. Fun, casual, relaxing. No big story, but fine for what it is.

A tired salary man with no special skill gets isekai into a fantasy world where human went extint a long long time ago. It turns out the human is the most op specie in the world with insane physical and magical power. Even one string of human hair left from ancient world can enhance one’s power.

MC is OP: being the only human in the world, mc is ... beyond OP. Even his normal fireball magic is too powerful to use as it might destroy his home or the entire forest, so he has to wear nerfing ring to nerf his magic power a thousand times. His normal pumch is op as well, not quite opm level, but enough to knock out boss characters.
However, this manga is never about the mc’s own fighting power as mc doesn’t fight that much. The manga focuses more on mc’s ability enhance other characters - basically his waifu army. They gain power by kissing mc as mc’s saliva contains lots of magical power, so much that it can make normal girls pass out in seconds (the powerful main girl can keep kissing for ten minutes though). On the top of that, it is very additive and can make girls feel horny. How convenient is that? As a matter of fact, his bath water alone has insane healing power. And his sp*rm, on the other hand, is too powerful (only shown once). Even the op main girl couldn’t take it.

Exploration? Unlike other isekai manga, this one does not have lots of exploration. Mc mostly stays at home with his army of waifu. Even the main exploration takes place at home, which starts out being a cave. Not just any cave, but the old home of a human genius from ancient time. There are several underground levels. Each serves a special function, which can be unlocked only after defeating the level golem (once defeated, the golem transforms into a cute girl as a servant). Functions include hot spring bathhouse, food facility, kitchen, printer, teleportation port, library, computer, etc. The MC is too much of a chicken to face all the golems in one go. He only explores the next level when necessary. Later on, the teleportation port becomes mc’s way to travel outside without revealing himself (but not that much).

Waifu army: main girl the elf magic knight/archaeologist, slime that turns cute girl, bear ear girl, main girls’s lesbian friend, vampire, “enermy” general, golem girls. They all likes the mc. The main girl in particular is obsessed with the mc. Rather than the mc, they are the main fighting power of the manga. To get stronger, they obtain mc’s “sacred” saliva by kissing, lots of kissing. Some of them start out being the enermy characters.

Main among harem? Yes, the main girl. They even got married (but that does not stop the harem) (this is barely a spoiler because it is last volume’s cover art).

Fan service? Lots of breasts scene (nipples showing). Lots of kissing. Nothing too explicit.

Villain? Yes, there is a recurring villain, not the fighting type, but the smart type that makes pills and manipulates from behind. He is also responsible for a being strong enough to be a life thread to the mc.

Explanation for human extintion. Yes, mostly in the last volume.

Funny filler story? Discovery of the printer inspires a manga contest with some reference to some famous mangas (including jojo).

Rating is based on personal ENJOYMENT. Technical-wise, I think it's 5 or less.

It's a world-building isekai fantasy with an OP MC (that is a walking treasure trove of power-ups and boosts) meant for casual and ecchi readers. Art is average.

The manga is fantasy-driven - not the genre - since its appeal is on fan service and what men presumably like. It’s pretty much a notch below hentai. It's for light and casual readers not looking for anything deep and meaningful nor dark and intense. Especially when it has harem and ecchi. Its end goal is to build a base for the MC to peacefully live ... in; because him siding with any nation would bring catastrophe. Again, don't look for anything deep and meaningful because you'll only be disappointed at pretty much everything, thus eventually dubbing this as trash after the first few chapters - which I agree(if I had expectations like yours). If you can get past its downsides with laughter(mockery) then it’d be a good pass-time read.

My advice:
If you like peaceful(boring) development that is reasonably paced(debatable). Go ahead.

If you want frequent(frequent) but not overly dramatic fan service. Go ahead.

If you appreciate an OP MC who's not a badass(he's a merciful coward) and who - like all men - fantasizes and does perverted things, and at the same time is stupider(100x) than you. Go ahead.

For the ecchi lover:
Uncensored chapters confirmed though the censored ones are the majority. Lots(lots) of kissing, expect kinks. MC can take chances.

Overall I enjoyed it, it's boring but good enough to pass time.

I am quite disappointed with this series. While the idea of a world where humans are revered as gods and there is a constant pursuit of their power seems intriguing at first, the manga falls too much into genre clichés. The frequent presence of ecchi scenes only serves to distract from the story and devalue its potential.

Furthermore, the lack of captivating battles and a consistent pace hinders the series from truly shining. The characters seem to be shallow and without significant development, leaving me wondering why I should invest emotionally in them.

Although the manga has moments of humor, it often becomes too forced and predictable. ... Overall, "The Strongest Sage with the Weakest Crest" failed to grip me with its story and characters. My final rating for this series is 3/10.