The official website of the anime movie inspired by Vocaloid music circle HoneyWorks revealed that the work will be titled Zutto Mae kara Suki Deshita.: Kokuhaku Jikkou Iinkai. The movie will open in theaters in Japan on April 23, 2016.

The updated website also revealed the first key visual (pictured), which was created by animator Maki Fujii. A trailer was uploaded to the YouTube channel of Aniplex, but it is region-locked to Japan. The complete production staff and additional cast members were also announced.

Cast
Yuu Setoguchi: Hiroshi Kamiya (Durarara!!)
Natsuki Enomoto: Haruka Tomatsu (Sword Art Online)
Souta Mochizuki: Yuuki Kaji (Shingeki no Kyojin)
Akari Hayasaka: Kana Asumi (Haiyore! Nyaruko-san)
Haruki Serizawa: Kenichi Suzumura (Kara no Kyoukai)
Miou Aida: Aki Toyosaki (K-On!)
Koyuki Ayase: Tsubasa Yonaga (Cardfight!! Vanguard)
Hina Setoguchi: Momo Asakura (Charlotte)
Koutarou Enomoto: Natsuki Hanae (Tokyo Ghoul)
Saku Akechi: Hikaru Midorikawa (Little Busters!)
Sena Narumi: Sora Amamiya (Isshuukan Friends.)

Staff
Director: Tetsuya Yanagisawa (High School DxD)
Script: Yoshimi Narita (Precure series)
Character Design, Chief Animation Director: Maki Fujii (Seirei Tsukai no Blade Dance)
Art Director: Yuki Unno (Junjou Romantica 3)
Color Design: Makiko Kojima (Chaos Dragon: Sekiryuu Seneki)
Director of Photography: Yoshihiro Sekiya (Shigatsu wa Kimi no Uso)
Editing: Aya Hida (Shingeki no Kyojin)
Sound Director: Yukio Nagasaki (Love Live! The School Idol Movie)
Sound Effects: Yasuyuki Konno (Gate: Jieitai Kanochi nite, Kaku Tatakaeri)
Studio: Qualia Animation

Kokuhaku Jikkou Iinkai is a series that HoneyWorks initially created for Vocaloid songs. Various seiyuu later joined the project to voice the characters depicted in the music videos, which were uploaded to Niconico and YouTube. The music videos have 100 million cumulative views on both platforms. A light novel series, Kokuhaku Yokou Renshuu, featuring the characters has also been published since February 2014.

PV (Region-locked)

(Alternative Link)

Source: Comic Natalie