Girlfriend, Girlfriend

is a romance-comedy manga series written by Hiroyuki. It was serialized starting on March 4, 2020 in Kodansha's Weekly Shōnen Magazine.

Plot
Mukai Naoya has loved Saki Saki since grade school, and when she finally accepts his feelings, he's at his happiest. But one day, a cute girl named Minase Nagisa confesses to him! Not wishing to choose only one over another, Naoya chooses to go out with both of them!! What will be of this love triangle that challenges morality itself?

Official

 * Author's Twitter Account: https://twitter.com/burumakun
 * Series' Twitter Account: https://twitter.com/kanokano_kc