She performs Ai no Uta often, but she also does other songs on music shows. People generally know her name and more songs than just this one.
So let's not make it worse than it is
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Made an update for her youtube views, cause I have some time at hand.
Extended the list to every PV having 400k.
Streaming update
youtube
01. Megumi no Hito - 3,571,204
02. Ai no Uta - 2,567,914
03. Cutie Honey - 1,568,568
04. Crazy 4 U - 1,317,511
05. you - 1,269,373
06. Butterfly - 1,116,791
07. Someday - 1,045,404
08. Moon Crying - 1,036,577
09. Koishikute - 947,037
10. It's all Love! - 858,981
11. BE MY BABY - 821,634
12. Suki de, Suki de, Suki de. - 819,143
13. BUT - 725,726
14. Love Me Back - 680,081
15. WON'T BE LONG - 670,294
16. Anata dake ga - 633,385
17. Koi no Tsubomi - 625,431
18. TABOO - 616,944
19. Pink Spider - 571,406
20. Unmei - 553,952
21. Aisho - 547,810
22. D.D.D. feat. SOULHEAD - 514,882
23. hands - 501,878
24. Cherry Girl - 498,551
25. Get Up & Move!! - 491,023
26. No Regret - 457,187
27. show girl- 451,369
28. Hot Stuff - 449,810
29. Ai wo tomenaide - 438,587
30. puff - 426,448
31. XXKK - 423,068
32. Shake It Up - 422,019
33. Selfish - 413,658
34. WIND - 399,888
Last update 31st August 2021
Spoiler:
01. Megumi no Hito - 3,274,507
02. Ai no Uta - 2,246,270
03. Cutie Honey - 1,390,556
04. Crazy 4 U - 1,228,414
05. you - 1,195,430
06. Butterfly - 1,005,638
07. Someday - 966,726
08. Moon Crying - 908,436
09. Koishikute - 879,226
10. It's all Love! - 807,138
11. BE MY BABY - 748,192
12. Suki de, Suki de, Suki de. - 701,188
13. BUT - 680,258
14. Love Me Back - 656,419
15. Pink Spider - 559,925
16. Koi no Tsubomi - 553,345
17. WON'T BE LONG - 539,922
18. Anata dake ga - 527,990
19. TABOO - 525,946
20. Unmei - 504,565
21. Aisho - 503,541
22. D.D.D. feat. SOULHEAD - 490,919
23. Cherry Girl - 467,652
24. hands - 463,866
25. Get Up & Move!! - 455,110