

Warning: Review contains spoilers.
I was actually surprised to see how low this anime was rated. I'll keep this short and sweet, just like the show itself - it's an anime that does exactly what it intends to do.
I had the brilliant idea of drinking and bingeing this anime. It was fantastic. I went in expecting what was advertised and got what was advertised.
This isn't a phenomenon anime like Re:Zero or My Hero Academia, and it isn't trying to be. It's an anime for a niche, for weebs who want a quick dose of easy fantasy fulfillment fanservice. If you're that niche, this anime is a high score. If you're not, it's a miss.
OneRoom is a point-of-view anime. You are the protagonist, the girls chat with you and you exchange dialogue with them that the studio chooses for you. The first two seasons are structured in arcs that will focus on one specific girl at a time for three to four episodes. Season three mostly follows the same format, but features some one-off episodes that bring back girls from the previous seasons.
Season one covers three bases for girls - the cute girl next door who bonds with you by helping her study. Hanasaki Yui.

She quickly grows a bond with you as you're next door neighbors. She has the most 'basic' storyline of all, which makes sense as she's the first appearance. She's the safe route. She has every typical trait you'd want and expect in an anime waifu - and that's fine, because you have to keep in mind that this is OneRoom you're watching, you're not trying to reinvent the waifu here.
The tsundere loli imouto - Momohara Natsuki. My personal favorite arc.

She surprises you with a visit and dotes on you as if she were a personal maid, or a mom. She cares about you, and though she may resist showing it, she loves you. Pretty typical, right? Again, this is OneRoom, you should have expected this from the second you read the description of this anime.
Sidenote: another review mentions this, and it is certainly correct - this arc has lots of feet.
And of course - the childhood friend. Aoshima Moka.

A musician with big dreams. You two clearly care for each other, and the dialogue that unravels will make it clear that you want nothing but for her to succeed. Kind of weak compared to every other arc in the series, but still cute at the end of the day.
The animation is and art style are both very pretty and lend themselves into helping this be a chill, easy watch. The shorts format (episodes are four minutes long) is also to the anime's benefit - if this were a standard twenty-two minute episode anime, it may have felt dragged out. Being short makes it like a chocolate bar - a quick and happy fix of sweetness.
It's quick, easy, comfort food moe anime. I recommend it.
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