For the original anime project "Towa no Yuugre" (English title: Eternal Twilight) by studio P.A.WORKS, four additional voice actors have been announced. Joining the cast are Miyuki Sawashiro (沢城みゆき), Tomori Kusunoki (楠木ともり), Toshiyuki Morikawa (森川智之), and Yohei Azakami (阿座上洋平).

The plot of the love story is set in a future world managed by a unified organization called OWEL, where artificial intelligence is highly advanced. The protagonist Akira awakens from cryosleep and embarks on a journey with Yuugre, an android who bears a striking resemblance to his former lover Towasa. Together, they explore the meaning of love in this new era.

Miyuki Sawashiro takes on the role of Yoiyami, an android and leader of an OWEL special unit who relentlessly pursues Yuugre. Tomori Kusunoki voices Hakubo, an android who accompanies Yoiyami. Toshiyuki Morikawa portrays Oboro, a compassionate wholesaler, and Yohei Azakami lends his voice to Yokurata, a former OWEL employee and historian.

The direction and series composition are handled by Naotaka Tsuda (津田尚克), the original character design is by Midori Tayama (タヤマ碧). Shuichiro Umeda (梅田修一朗) voices Akira, Yui Ishikawa (石川由依) voices Yuugre, and Ai Kayano (茅野愛衣) voices Towasa.