Girlfriend, Girlfriend Vol. 5 (Kodansha, 2021)

The hot springs trip is over and Nagisa has grown ever closer to Naoya. Afraid of losing her place, Saki puts on a bunny girl costume to seduce Naoya! Not letting herself be bested, Nagisa retaliates with her own maid costume! Every day is just filled with chaos and fun as time flashes by and now we're finally heading straight into the eventful and heated summer break! Or, that was the plan… To stop their polygamous relationship, Shion joins the three of them and is now living at Naoya's, too! What's going to happen to their exciting summer plans?!