The popular Japanese portal Anime!Anime! conducted a survey among its subscription-based readers with the question "Which opening theme song [Opening] do you think has been the best so far this Winter-2021 season?". The survey was conducted between January 26 and February 2 of this year, with a total of 179 entries.
It is worth noting that, although the number of participations is low, these are users who are subscribed to the site, so there is an economic cost behind the participation. That is why the results of the surveys of this portal are so referenced by the media in Japan, unlike surveys that users conduct on social networks and where anyone can undermine the fidelity of the results with multiple accounts.
Finally, it should be noted that this survey evaluated the musical themes, not the anime sequences, which is why the anime Mushoku Tensei: Jobless Reincarnation is listed, despite the fact that to date it has not presented its opening sequence within its broadcast.
Results - Most Popular Anime Opening of Winter-2021
10. Horimiya - "Iro Kousui" by You Kamiyama
9. Mushoku Tensei: Jobless Reincarnation - "Tabibito no Uta" by Yuiko Oohara
8. World Trigger 2nd Season - "Force" by TOMORROW X TOGETHER
7. 2.43: Seiin Koukou Danshi Volley-bu - "Mahi" by Yama
6. Jujutsu Kaisen - "VIVID VICE" by Who-ya Extended
5. Shingeki no Kyojin: The Final Season - "Boku no Sensou" by Shinsei Kamattechan
Jaku-chara Tomozaki-kun - "Junsei Easy?" by DIALOGUE+ 3.
3. Kemono Jihen - "Kemono Michi" by Daisuke Ono
2. Gotoubun no Hanayome 2nd Season - "Gotoubun no Katachi" by Nakanoke no Itsuzugo
1. Osomatsu-san 3rd Season - "Mutsugo no Tamashii Nayuta Made" by AOP
Source: Anime!Anime!