Background:
I think the Harem Genre has gotten a little bit stale and repetitive over the years, and i had ZERO expectations going into the trailer for 100kano
When i asked my friends if the anime was good, everyone immediately went all hive-minded and said "IT'S FUCKING PEAK YOU MUST WATCH IT NOW!"
And after finishing it, they were 100% right.
Animation: 
While seemingly very safe in the surface, it does have a lot of soul and charm in all of the scenes.
Clearly Bibury has improved drastically in how they animate things, and that makes this anime REALLY enjoyable, all of the goofs, jokes are enhanced A LOT by the animation, and this is by far the best part in my opinion.
The world that encompasses Rentarou and his "Geass Power" (as i would like to call it, unofficial name tho) is full of surprises and twists that make every single joke feel unique along with the places the cast goes to, and the many problems that the main character of this series has to face.
Characters:
Not the most fleshed out characters in the world, but they aren't personality-less (aside from, 1 technical one)
Let's start with the Unluckiest, turned Luckiest, Rentarou Aijou.
HE'S QUITE LITERALLY the best part about the characterization in my opinion (at least, in this season), as explained in the Animation section, he has the "Power of Infinite Lust" from God himself, he does know his limits (literally in the title, only 100 girlfriends), but he didn't know how much the affected female would become in terms of irresistibility to him.
He's like the human embodiment of Rick Astley's "Never Gonna Give You Up" chorus (in a good way, not the trolling way, I'm serious).
He always tries his ultimate best to appease the ever-increasing amount of girls, not letting them down, saying goodbye, and never had thoughts of hurting them using lies.
Hakari is just your standard love-interest-type character, that really likes to reveal her body (for some reason), and overall, way more lustful to him than EVERY SINGLE GIRL in the cast, and she does have a very great character arc later in the series (that I will talk about later)
Karane is an actual Tsundere that I genuinely like (shocking, i know, despite my hatred towards them.), and actually one of the more charming one I've seen, because she isn't overly toxic, and does have a great bond with Hakari (they kissed each other, twice btw)
Next is much more shy one, yet full of charm, using her phone to communicate, Shizuka (on second thought why is "Shizuka" such an uncommon name in fiction).
Shizuka has the greatest introduction to any of the girls in the cast in my opinion, episode 3 is where we see Shizuka in her full glory, with a very touching backstory as to why she didn't speak, rather used a book (initially), and after having eye contact with Rentarou, as time passes, he gets to know Shizuka better, eventually being Rentarou's lover.
The script shines in this department, as it depicts her feelings to Rentarou similar to a Fantasy Love Story, and that is a nice touch.
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Followed up the shyness is Nano.If you have played any of the Project Moon games/read the lore for Library of Ruina, she is basically Angela. If you HAVEN'T though, just make sure to know that Nano is quite robotic and nerdy compared to the other girls in the cast, as she initially speaks in quite a harsh manner to Rentarou at first, but after a little bit of dating, her mind changes, and over time, learns about him and his past and even future girls.
Further down there is a literal mad scientist who would fuck around in every turn and find out, Kusuri.
Her main appeal is her ability to create any drug in the world, along with cures for any drug (hope she makes one for cancer though, that would save a lot of lives).
On the subject of drugs (don't do them, kids), the "Resident Evil"/Kiss Zombie Arc is a very intense one and serves to act as a sign of comedy, and development for her character, as she learns from her mistakes and then develop near flawless ones.
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The final one is Hakari's mom, who's funnily enough, named after the Japanese of "Mother", Hahari.She was initially introduced as the Queen of the Hanazono family (with a somewhat concerning, and really dark backstory of child birth for some reason), who KNEW about what happened to Hakari and wanted to stop her relationship with Rentarou, so the cast has to find a way to somehow counteract Hahari's acts.
Her house was BUILT LIKE FUCKING AREA 51 IN TERMS OF SECURITY, so they have to plan ahead at every turn, it could be making fake noises to disrupt the police, bypassing the lasers, and many other means.
With the help of Rentarou's tears removing the laser detecting eyes, she IMMEDIATELY falls in love with him, and it got turned into something that is both very funny and turned into a darker one (especially for Hakari's side).
(The entire dynamic between Hakari and Rentarou is enhanced even more by this, and it really shows how much Hakari meant for Rentarou).
And thus wanting Rentarou to take care of Hakari along WITH her.
Story: 
there is a surprising amount of depth here, considering the fact it follows some of the main curses of an SOL (mostly storyless).
Aside from Hakari's arc, all of the characters have each of their seperate ways to grow and change as Rentarou falls in love with them.
the pacing is really fast, and that helps the comedy, and the slow moments are also well thought out and didn't disrupt the pacing due to the amazing soundtrack.
the atmosphere is really alive too. Anything right or wrong could happen at any moment.
One minor nitpick: In my humble opinion, the opening is really grating and annoying to listen to.
I understand the show's premise is Infinite Lust, but you don't need to keep saying "really love" in every part of the chorus.
The references in this show are cool and are a nice throwback for me, especially the Tom Cruise one.
Overall thoughts
A must-watch, this is easily the best first-impressions-type harem for anyone to start with, and even if you watched harems in the past, you will still find a metric ton of enjoyment when watching this.
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