"Jōshi no Asoko wa XL Size!? Futoi Sakippo... Haitteru...!" is a romantic comedy manga that explores themes of workplace dynamics, body positivity, and unconventional relationships. The story centers on Haruka Momose, a young office worker who harbors a secret crush on her boss, Shūichi Ōmiya. Haruka is self-conscious about her body, particularly her larger-than-average buttocks, which she believes makes her unattractive. Despite her insecurities, she finds herself drawn to Ōmiya, who is known for his strict and stoic demeanor.

The narrative takes a surprising turn when Ōmiya unexpectedly confesses his feelings for Haruka, revealing that he has been attracted to her precisely because of her physical traits. This confession shocks Haruka, who struggles to reconcile her insecurities with Ōmiya’s genuine admiration. As their relationship develops, the story delves into their interactions at work and in private, highlighting the challenges of navigating a romantic relationship between a subordinate and a superior in a professional environment.

The manga balances humor and heartfelt moments, often using Haruka’s self-deprecating thoughts and Ōmiya’s blunt yet caring personality to create comedic tension. Supporting characters, such as Haruka’s coworkers, add depth to the story by providing contrasting perspectives on relationships and body image. The series also addresses societal pressures and stereotypes surrounding physical appearance, particularly for women, while emphasizing the importance of self-acceptance and mutual respect in relationships.

Through its blend of workplace romance and comedic elements, "Jōshi no Asoko wa XL Size!? Futoi Sakippo... Haitteru...!" offers a lighthearted yet meaningful exploration of love, confidence, and the complexities of human connection.