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I own nothing in this video, everything belong to the rightful owners.
Bonus songs may be not vocaloid songs.

Intro song: Chain Girl - Noboru↑-P (Hatsune Miku)

Vocaloid on a pictures:
intro - MEIKA Mikoto, MEIKA Hime
easy - Hatsune Miku
normal - Macne Nana
hard - Nekomura Iroha
very hard - flower
bonus - Otomachi Una


Answers:
1. Senbonzakura - Kurousa-P (Hatsune Miku)
2. Luka Luka★Night Fever - samfree (Megurine Luka)
3. A Tale of Six Trillion Years and a Night - kemu (IA)
4. Lost One's Weeping - Neru (Kagamine Rin)
5. Rolling Girl - wowaka (Hatsune Miku)

6. Chururira Chururira Daddadda! - KurageP (Yuzuki Yukari)
7. Kimagure Mercy - Hachioji-P (Hatsune Miku)
8. Drop pop candy - Giga-P, Reol (Kagamine Rin, Megurine Luka)
9. Copycat - CircusP (GUMI)
10. MONSTER - KIRA (GUMI)

11. A Fake, Fake, Psychotropic - Kairiki Bear (GUMI)
12. Positive☆Dance Time - kinoshita (Otomachi Una, Kagamine Rin)
13. 39 Music - Mikito-P (Hatsune Miku)
14. Hibana - DECO*27, Mes (Hatsune Miku)
15. Alien Alien - NayutalieN (Hatsune Miku)

16. Secret - Ryuuuu (Megurine Luka)
17. Suicide Song - Nashimoto-P (Hatsune Miku)
18. Be Friends Again - Aku P (DAINA)
19. Manic - *Luna (Otomachi Una, Rana)
20. Tranquilizer - xhloe (Hatsune Miku)

21. La Llorona - Steampianist,TSutauseries (MAIKA, GUMI, OLIVER)
22. Nakakapagpabagabag - Dasu (Kagamine Len)
23. Sekiranun Graffiti - ryo(supercell) (Hatsune Miku)
24. Record Red - shr (Kagamine Rin)
25. PONPONPON - Kyary Pamyu Pamyu (Kagamine Len) Cover

I'm sorry if there are any mistakes