In "Rent-A-Girlfriend" Volume 4, the rollercoaster of emotions for Kazuya Kinoshita doesn't seem to ease up, even after a supposedly relaxing hot springs trip with his rental girlfriend, Chizuru Mizuhara. Despite the intense experience, Kazuya remains hapless and deeply confused about the nature of their relationship.

As the story unfolds, Kazuya attempts to gain some clarity by taking a step back and having some time away from Chizuru. However, the narrative takes an intriguing turn with the introduction of a mysterious new figure. This enigmatic character enters the picture, wielding knowledge about Kazuya's "romantic" life, adding a layer of complexity and intrigue to the storyline.

The hot springs trip, which was meant to provide a respite, proves to be just another chapter in Kazuya's turbulent romantic journey. The tension, misunderstandings, and emotional turmoil persist, keeping readers on the edge of their seats as they follow Kazuya's attempts to navigate the complexities of love and relationships.