Use the search, Luka!
CITY OF BEASTS
EXIT TUNES PRESENTS Entrance Dream Music
MEKAKUCITY M’s COMPLETE～メカクシティアクターズ・ヴォーカル＆サウンド コレクション～
EXIT TUNES PRESENTS Vocaloconnection feat. 初音ミク
Scrummble might be right, though. Jin is the original composer and might've manipulated ONE's voice and TeddyLoid could just arrange it. At least that's how I understand "Jin feat. ONE | Arranged by TeddyLoid" credit.
@Scrummble usually the original producer is only credited in the original song (so normally not here) and I think the only reason he is credited is for legal reasons (since this a partially official upload) or maybe just to add... well... more importance to the song by citing Jin, without Jin having any direct input on the song.
Well, this song features "Jin feat ONE | Arranged by TeddyLoid", So I added Jin as an artist
I am going to link Matsuda Toki and Matsudappoiyo's pages together since, as far as I know, Matsuda Mattsun is another name for Matsuda Toki, thus Matsuda Toki is the creator of Matsudappoiyo and Keine Ron along with Matsudappoine.
Soundcloud link is a short sample version, song will be longer.
奏音69 sings as support, but I don't want him to be listed as support under producers
That name on the KarenT page makes more sense, plus KarenT is an official source so it should be preferred anyway. Please remember not to trust machine translators, even if more than one translator gives the same result.
I think you are right. I can here a voice that sounds like Nekomura in the chorus, but it could be a second append of Megurine Luka or an append tuned differently.