Project Sekai Trivia Quiz - Are u really fan of sekai? ( Ena shinonome & My birthday special video )

Many things are considered but are you a Sekai fan?
Here are the clues:
No.1 - In Japanese commercials; before the rest leo/need members, this is the first character to join as an ambassador.
No. 2 - No clue
No. 3 - Fun fact as a youtuber; I joined sekai after it was released in Japan.
No.4 - before Stella song, this is basically the beta gift song for all players.
No. 5 - 4 = 1
No. 6 - no clue
No. 7 - Listen carefully ; )
No.8 - song by bumb of chickens and tie-up with project sekai as 1 of 2 songs.
No. 9 - no clue
No. 10 - Toya
No.11 - miku and haruka's emu banner together in gacha.
No.12 - Kemu song feat. IA (it has sekai version)
No.13 - No comment & clue
No.14 - in this episode where it is mostly relatable or bet by the mikus who died (the neko miku was his correct bet).
No.15 - no clue
No.16 - no clue
No. 17 - no clue
No.18 - he is with professor Mikudayo
No.19 - it's already released on Spotify and iTunes (also on soundboard and on youtube/nico videos)
No. 20 - 39 themes.
BGMs: / project sekai - topic
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