After reading The Sleep Residents of Birdcage Manor and Horimiya, I found out that I enjoy that I really like this type of art. It is not overly detailed but has a wonderful sense of sophistication and appeal. The authors also know how to spin a story and make very convincing characters. Are there any other manga that are similar to these (art wise)?

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try Hakuji and Kiss ni Juuzoku

If you don't mind shounen-ai/yaoi Hana no Mizo Shiru and Seven Days from the same artist. ^^

Then maybe try Jiujiu, Himawari, Gozen 3-ji no Muhouchitai...

Shounen-ai/Yaoi with similar art: Anata no Tame nara doko Made mo

I will add others later, but I can't think of anything right now.

Thanks I will try that out

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Last Game
Annarasumanara
Houkago x Ponytail
Kimi ga Hikari and oneshots by the same artist.

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Nulla in mundo pax sincera
"Always go too far, because that's where you'll find the truth." - Albert Camus

Try out Hibi Chouchou! Even though it may be not the type you're looking for, the art is so beautiful and it's not too complicated (meaning simple). Also, it has a great plot

i second Hibi Chouchou, the art is really really beautiful, probably one of the best i've ever seen

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"I couldn't see any other club in the world bigger than The Arsenal" - Tony Adams

~ gakighost.wordpress.com ~

Definitely Tomodachi no Hanashi, just beautiful art. Most manhwas have great digital art too. I second Annarasumanara! It has original and "out-there" art at times.

Try manga by YUMEKA Sumomo
Examples: Watashitachi no Shiawase na Jikan
Hoshi no Koe
My Girl (SAHARA Mizu)

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Gakuen Babysitters fits.
Not so simple, but Hirunaka no Ryuusei's art is beautiful.

If you don't mind yaoi, Orutana and Non Tea Room maybe?

Taiyou no Ie is pretty nice
I love those 2 manga too, and I liked the works by Takagi Shigeyoshi; maybe you'll like it