"Tamon-kun Ima Docchi!?" is a comedic manga series that revolves around the life of Tamon Yamashita, a high school student who finds himself in an unusual predicament. Tamon is an ordinary teenager with a passion for soccer, but his life takes a bizarre turn when he discovers that he has a split personality. This alternate persona, known as "B," is a flamboyant, confident, and somewhat narcissistic individual who emerges unpredictably, often at the most inconvenient times. The duality of Tamon's personality creates a series of humorous and chaotic situations as he navigates school life, friendships, and romantic interests.

The story explores Tamon's struggle to maintain control over his life while dealing with the antics of his alter ego. B's sudden appearances often lead to misunderstandings, as his bold and outspoken nature contrasts sharply with Tamon's reserved and timid demeanor. This dynamic becomes particularly complicated when Tamon develops feelings for his classmate, Yuki Hoshino, a kind and cheerful girl who becomes a central figure in his life. Yuki is initially unaware of Tamon's dual personality, but as the story progresses, she becomes entangled in the comedic and often absurd scenarios that arise from Tamon's condition.

Supporting characters add depth to the narrative, including Tamon's best friend, Shogo, who is aware of Tamon's split personality and often serves as a voice of reason amidst the chaos. Other classmates and schoolmates contribute to the humor and drama, creating a lively and engaging high school setting. The series balances slapstick comedy with moments of genuine emotion, as Tamon grapples with his identity and strives to reconcile the two sides of himself.

The plot unfolds through a series of episodic adventures, with each chapter presenting new challenges and humorous situations stemming from Tamon's dual personality. The manga maintains a lighthearted tone, using the contrast between Tamon and B to explore themes of self-acceptance, friendship, and the complexities of adolescence. The interplay between the characters and the unpredictable nature of B's appearances keep the narrative dynamic and entertaining, making "Tamon-kun Ima Docchi!?" a distinctive and enjoyable read within the comedy genre.