Year 2021 could be romantic year in the world for a number of reasons!!!
 As there number romantic animes that have aired and some that are yet to come in 2021!!! 
1.Horimiya Anime!!!
Hori-san to Miyamura-kun is a Japanese shōnen web manga series 
written and illustrated by Hiroki Adachi, under the pseudonym Hero.
The anime was the best way to start the year 2021.The anime had 13 episodes.And each episode were built Beautifully.
Each of the characters had their own roles to play.And it was done wonderfully.Both the Manga & the anime series of Horimiya Officially ended.There's a very less chance of a season 2.Whatever the Case,It was a classic way to start the year!!
2.Quintessential Quintuplets Anime!!! 
The Quintessential Quintuplets is a Japanese manga series written 
and illustrated by Negi Haruba. It was serialized in Kodansha's Weekly 
Shōnen Magazine from August 2017 to February 2020
After a successful season 1.The season 2 of the anime aired in 2021!!.Although there might be mixed feelings about the Season 2 among the fans.But the anime did a pretty good job.And after finishing season 2 they have announced season 3 for the anime!!!
As season 3 is in the works, a lot more to come from Quintessential Quintuplets!!3.Higehiro Anime!!! 
Higehiro, short for Higehiro:
 After Being Rejected, I Shaved and Took in a High School Runaway 
(ひげを剃る。 そして女子高生を拾う。, Hige o Soru. Soshite Joshi Kōsei o Hirou.), is a 
Japanese romantic comedy light novel series written by Shimesaba and illustrated by booota.
Higohiro Anime aired at the time when Horimiya and Quintessential Quintuplets ends.
A good time at that.As the manga and anime has quite an different and interesting story fans can't wait to see how this anime turns out!!!
4.Kaguya Sama:Love is War!!!
Kaguya-sama: Love Is War is a 2019 Japanese anime series, based on the manga series of the same title, written and illustrated by Aka Akasaka.
 Student council president Miyuki Shirogane and vice-president 
Kaguya Shinomiya appear to be the perfect couple, but both are too proud
 to confess their love and scheme to make the other confess their love 
first.
After having successful season 1&2.Kaguya Sama:Love Is War announced their season 3& Ova to air in 2021.
So be ready for this anime!!!
5.Tonikawa:Over the Moon For You!!! 
Fly Me to the Moon, also known outside Japan as Tonikawa: Over the
 Moon for You, is a Japanese manga series written and illustrated by 
Kenjiro Hata. It has been serialized in Shogakukan's Weekly Shōnen 
Sunday since February 2018
 It got anime adaption 2020, and had a pretty good season.As it was a good way to end the year 2020,
It is confirmed that the anime's Ova is going to Air in 2021!!!
6.Bottom tier character Tomozaki!!! 
Bottom-tier Character Tomozaki (Japanese: 弱キャラ友崎くん, Hepburn: Jaku-kyara Tomozaki-kun, also known as The Low Tier Character "TOMOZAKI-kun")
 is a Japanese light novel series written by Yūki Yaku and illustrated 
by Fly. Shogakukan has published nine volumes since May 2016 under their
 Gagaga Bunko imprint.
Even though it came at a time when Horimiya anime was in the lime light.It did quite impressive job with it's storyline and characters!!!
7.Oregairu!!! 
My Youth Romantic Comedy Is Wrong, As I Expected, abbreviated as 
OreGairu and Hamachi, and also known as My Teen Romantic Comedy SNAFU, 
is a Japanese light novel series written by Wataru Watari and 
illustrated by Ponkan8.
 This anime has done quite a good job and still giong strong!!!
8.Osamake!!!
Osamake: Romcom Where The Childhood Friend Won't Lose, abbreviated
 as OsaMake, is a Japanese romantic comedy light novel series written by
 Shūichi Nimaru and illustrated by Ui Shigure. ASCII Media Works have 
published six volumes since June 2019 under their Dengeki Bunko imprint.
This anime has started smoothly along with the other romantic animes as the love battle continues!!!
9.Fruits Basket!!!
Fruits Basket, sometimes abbreviated Furuba or Fruba, is a 
Japanese manga series written and illustrated by Natsuki Takaya. It was 
serialized in the semi-monthly Japanese shōjo manga magazine Hana to 
Yume, published by Hakusensha, from 1998 to 2006.
It has been a top notch start for this anime as they have in the top of their game from the anime rankings,character rankings and even couple rankings!!!
10.Koikimo!!!  
Koikimo, short for Koi to Yobu ni wa Kimochi Warui, is a Japanese 
romantic comedy illustration collections by Mogusu. It was first 
uploaded on Pixiv until it gets an online manga serialization on 
Ichijinsha's Comic POOL digital manga magazine in January 2015.
Romance continues for this anime!!
Many more exciting moments to come!!!
11.Uzaki Chan Wants To Hang Out!!!
Uzaki-chan Wants to Hang Out! is a Japanese manga series written 
and illustrated by Take. It has been serialized through Niconico Seiga's
 Dra Dra Sharp website since December 2017 and collected in six tankōbon
 volumes by Fujimi Shobo as of March 2021.
  
After a successful season 1, season 2 of the anime was announced but it could release in late 2021 or in the start of 2022!!!
Whenever it starts, there is high hopes for the Anime.
12.Komi can't communicate!!!
Komi Can't Communicate is a Japanese manga series written and 
illustrated by Tomohito Oda. It has been serialized in Shogakukan's 
Weekly Shōnen Sunday since May 2016, with its chapters collected in 
twenty-one tankōbon volumes as of May 2021.
After doing well in the manga, it finally got anime adaption and is set to release in 2021!!!
 13.Don't Toy With Me Miss Nagatoro
 Don't Toy with Me, Miss Nagatoro is a Japanese web manga series 
written and illustrated by Nanashi, also known as 774. The web manga 
began its serialization in Magazine Pocket, an online and app based web 
manga magazine published by Kodansha, in November 2017
'Don't Toy with Me, Miss Nagatoro,' or 'Ijiranaide, Nagatoro-san,' is a slice-of-life romantic anime
 that revolves around Senpai, a socially awkward high schooler who has 
to endure verbal abuse from his peers because of his eccentric 
interests.Things are getting interesting for this Anime!!!
 14.The Saint's Magic Power is Omnipotent
The Saint's Magic Power is Omnipotent is a Japanese light novel 
series written by Yuka Tachibana and illustrated by Yasuyuki Syuri. It 
began serialization online in 2016 on the user-generated novel 
publishing website Shōsetsuka ni Narō. An anime television series adaptation by Diomedéa premiered on April 6, 2021.The sweet texture of the anime is worth watching as this anime is set for a perfect ending!!!
15.Girlfriend,Girlfriend!!! 
Yes, believe it or not this is the name of the anime.
Girlfriend, Girlfriend is a Japanese romantic comedy manga series 
written and illustrated by Hiroyuki. It began serialization in 
Kodansha's Weekly Shōnen Magazine in March 2020, and has been compiled 
into six tankōbon volumes as of June 2021.It's japanese name is Kanojo mo kanojo.
It did a decent job!!! 
 16.Remake Our Life!!!
Remake Our Life! is a Japanese light novel series written by Nachi
 Kio and illustrated by Eretto. Media Factory have published eight 
volumes and two spin-off volumes since March 2017 under their MF Bunko J
 imprint.Even though the storyline  of Remake Our Life Anime might put some people off. But the anime was quite enjoyable.
  17.Duke of Death and his made
The Duke of Death and His Maid is a Japanese romantic comedy manga
 series by Koharu Inoue. It has been serialized online via Shogakukan's 
Sunday Webry website since October 2017 and has been collected in 
thirteen tankōbon volumes as of July 2021.
  
All in all, year 2021 is a year for romantic animes.
What are your thoughts on these animes?
Let me know in the comments!!!