If you're looking for anime similar to Love Live! Sunshine!!, you might like these titles.
It is spring, the season of great changes. Hikari Kohinata is an overwhelmingly cheerful and outgoing 15-year-old girl who has spent all her life in a small and beautiful seaside town on the Izu peninsula. On the first day of high school, she meets Futaba Oki, a slightly introverted girl who has just moved from Tokyo. Before she knows it, Futaba gets dragged along into Hikari's passion for scuba diving. And from there, Futaba gradually starts to come out of her shell, and learns how to take challenges and dive into the ocean of life.
Both focus on high school girls and their club activities. Both mix slice-of-life element and humour with more serious subplots about overcoming anxiety/past failure/stage fright. Further, the shows have similar settings - ocean towns, and a lot of breathtaking background art featuring the ocean (both from above and below). Love Live! Sunshine!! is much faster paced, but if you like one you might as well check out the other.
Both series involve school girls who live in a seaside town in out on the country side.
LLS and Amanchu also focuses a lot on the girls main club(s) (Idols and diving).
The friendships and bonds within both of these series are also rather prevalent.
So both of course also have some ship teasing between the girls.
They are both also great series to watch if you just want some wholesome entertainment.
Ten-year-old genius Chiyo, animal-loving Sakaki, loudmouth Tomo, athletic Kagura, weight-conscious Yomi and dim-witted Osaka are six friends who share laughs, good times, and a high school homeroom. With scary (and sometimes perverted) teachers, school festivals, penguin suits and general hilarity abounding, you can be sure that there's never a dull day in the life of one of these students!
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Both anime have a great cast of highschool girls with wacky personalities. Sunshine has more of a plot, but if you like the humor of one I think you'll like the humor of the other.
Chihaya Ayase is a famous beauty at her school, but she’s far from a conventional girl. Three years ago in her final year of elementary school, Chihaya and her friend Taichi became infatuated with the card game, Karuta, after connecting with a lonely boy named Arata Wataya. But when the trio graduated from elementary school, they each went their separate ways but shared one common goal: to excel in the game and meet each other at the national championships. Now, Chihaya is attempting to share her passion for the game by creating a competitive Karuta club at school, but when she reunites with Taichi it seems that maybe she’s the only one with the intention of fulfilling their childhood promise...
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Both series feature a female protagonist who used to think of herself as plain and normal until she became passionate about a competition and decides to start a club at her school for it.
Ouran High is a school for the extremely wealthy or, in Haruhi's case, the extremely talented. But no amount of talent will help when Haruhi accidentally drops an eight million yen vase in a music room. The vase was the property of Ouran High School Host Club, a group of attractive young men who, for a fee, provide their time and affections for their lovesick clientele: the female students. Fascinated by this strange new specimen, a poor and clumsy commoner, they force Haruhi to work for them until the debt is repaid; but they get a lot more than they bargained for...
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So Love Live takes itself a little more seriously (...sort of), but both deal with a school club that contains wacky characters. They're also both focused on the characters themselves--these shows lean heavily on them, but they can carry the weight.
With all forms of entertainment banned, a group of bold young women do the unthinkable: resurrect a legendary J-Pop band, forming an all new Band of Sisters known as AKB0048! But these rockin' rebels aren't just singers. They're trained in combat as well as choreography and willing to sacrifice their lives for intergalactic harmony. As the new recruits enter basic training, the veterans provide the musical soundtrack and pass their batons and battle gear to a new generation of daring divas.
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The legendary warrior, Cure Moonlight, was defeated and it's up to shy Tsubomi and fashion-obsessed Erika to step up and become the next Precure team. Together they must battle the Desert Messengers, an evil organization preying on the negative emotions blooming in people's hearts. They want to help their friends and the quickly-wilting Great Heart Tree by collecting Heart Seeds, but can they prevail given they are the weakest Precure in history?!
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Both series fall into that category of series that aren't "officially" GL but might as well be. Sunshine is more gay than Heartcatch but both series still feature high levels of Ho Yay. If you just want to sit back and watch girls being cute with each other but want a bit of a plot and some character development and/or want something that heavily features female friendships, I'd recommend either of these series. Both series also have breathtaking animation and music in them. I will warn that Heartcatch has a lot of episodes that are more or less filler and ultimately has a heavier plot than Sunshine though.