Check out the opening of Kanojo mo Kanojo ( Girlfriend, Girlfriend! ). According to the official website, it arrived on July 2nd on Japanese TVs.
Check it out:
Synopsis:
Naoya is a first-year high school student. After confessing his love to Saki , the girl he's loved for a long time , they decide to start dating, and Naoya's life is filled with happiness. However, one day, a beautiful young woman named Nagisa also confesses her love to Naoya.
Naoya and Nagisa immediately hit it off, and he tells Nagisa he already has a girlfriend. But she vows to confess her feelings to him again, when he suddenly proposes that they talk to Saki about dating both of them at the same time. Saki and Nagisa hit it off immediately, and although Saki is initially angry and reluctant about the idea, she eventually agrees.
Finally, Kanojo mo Kanojo is directed by Satoshi Kuwabara ( Gotoubun no Hanayome ) at Tezuka Productions (Dagashi Kashi).