"Doing His Best to Confess" centers on the romantic struggles of its protagonist, a high school student named Haruto, who harbors deep feelings for his classmate, Yui. Despite his strong emotions, Haruto finds it incredibly difficult to express his feelings due to his shy and introverted nature. The narrative explores his attempts to overcome his insecurities and muster the courage to confess his love, often leading to humorous and heartfelt situations.

Haruto's journey is marked by a series of missteps and awkward encounters, as he navigates the complexities of teenage emotions and social dynamics. His best friend, Riku, often provides comic relief and moral support, encouraging Haruto to take bold steps while also teasing him about his hesitations. Yui, on the other hand, is portrayed as kind and approachable, though she remains unaware of Haruto's feelings for much of the story. Her interactions with Haruto are filled with subtle moments of connection, hinting at a potential mutual interest.

The plot progresses through a series of episodic chapters, each focusing on Haruto's incremental efforts to grow more confident and articulate his feelings. These efforts range from writing anonymous letters to practicing his confession in front of a mirror, all of which highlight his determination and vulnerability. The story also delves into the perspectives of secondary characters, such as Yui's close friend, Aya, who occasionally offers insights into Yui's thoughts and feelings, adding depth to the narrative.

As the series unfolds, Haruto's journey becomes a blend of comedic mishaps and poignant moments, capturing the universal experience of first love and the challenges of self-expression. The manga balances lighthearted humor with genuine emotional stakes, making it a relatable and engaging exploration of young love and personal growth.