The official website for Hajimete no Gal has announced additional cast and staff members. The anime is slated for Summer 2017.

Cast
Shinpei Sakamoto: Toshiyuki Toyonaga (Digimon Universe: Appli Monsters)
Keigo Ishida: Kenji Akabane (Masou Gakuen HxH)
Minoru Kobayakawa: Minoru Shiraishi (Nichijou)

Staff
Supportive Director: Yuuki Ogawa (Ooyasan wa Shishunki! director)
Color Setting: Chiharu Tanaka
Prop Design: Hideyuki Satake (Sakura Quest director of animation), Keisuke Nishijima (Okusama ga Seitokaichou!+! episode director)
3D Director: Masayoshi Takeda (Orange CG director)
Director of Photography: Toshioki Kuno
Editing: Keisuke Yanagi (Tokyo Ghoul √A)
Sound Director: Masakatsu Oomuro (Bernard-jou Iwaku.)
Sound Effect: Yuka Kazama (Ketsuekigata-kun!)
Sound Production: Glovision
Music: Yashikin (Anitore! XX)
Music Production: MAGES.
Production: "HajiGal" Production Commiittee

The first two episodes will be pre-screened at Shinjuku Piccadilly on June 25, where voice actresses Yuki Nagaku (Yukana Yame), Ayana Taketatsu (Yui Kashii), and Yui Ogura (Nene Fujinoki) will attend for a talk show.

Source: Ota☆Suke