"How's Your Ex?" is a manga series that explores themes of past relationships, personal growth, and the complexities of reconnecting with former partners. The story centers around two main characters, Aoi and Haruto, who were once in a serious relationship during their high school years. Their breakup was abrupt and left unresolved emotional wounds for both. Years later, they unexpectedly cross paths again as adults, leading to a series of interactions that force them to confront their shared history and unresolved feelings.

Aoi, now a reserved and pragmatic individual, has built a stable life but struggles with lingering regrets about her past decisions. Haruto, on the other hand, has become more carefree and outwardly confident, though he harbors his own insecurities about the breakup. Their reunion sparks a mix of nostalgia, tension, and curiosity, as they navigate the awkwardness of reconnecting while grappling with how much they have each changed.

The narrative unfolds through a series of flashbacks that reveal key moments from their high school relationship, providing context for their current dynamics. These flashbacks highlight the misunderstandings, miscommunications, and external pressures that contributed to their breakup. As the story progresses, Aoi and Haruto are drawn into each other's lives once more, often finding themselves in situations that blur the lines between friendship and romance.

Supporting characters, such as mutual friends and new acquaintances, play significant roles in influencing the protagonists' decisions and perspectives. These characters often serve as catalysts for Aoi and Haruto to reflect on their past and consider whether they are truly ready to move forward—either together or apart. The manga balances moments of humor, introspection, and emotional tension, creating a nuanced portrayal of how past relationships can shape present identities.

The plot avoids simplistic resolutions, instead focusing on the gradual process of healing and self-discovery. Aoi and Haruto's journey is marked by moments of vulnerability and growth, as they learn to confront their fears and insecurities. The series ultimately raises questions about whether rekindling a past relationship is a step backward or an opportunity for closure and renewal. Through its exploration of love, regret, and second chances, "How's Your Ex?" offers a thoughtful and relatable narrative about the enduring impact of past connections.