"Teki wa Tsuyoi zo Tegowai zo" centers on the life of Yuki, a high school student who struggles with social interactions due to his extreme shyness and lack of confidence. Despite his timid nature, Yuki possesses an unusual ability: he can see the "power levels" of people around him, represented as numerical values. This ability, which he refers to as "Tegowai," allows him to gauge the strength and potential of others, though it often leaves him feeling inferior and overwhelmed.

The story takes a turn when Yuki encounters a mysterious transfer student named Riku, whose power level is off the charts. Riku is confident, charismatic, and seemingly fearless, embodying everything Yuki is not. However, Riku reveals that he is being pursued by a dangerous organization seeking to exploit individuals with extraordinary abilities. Recognizing Yuki's potential, Riku enlists his help to navigate the challenges posed by this organization, forcing Yuki out of his comfort zone and into a world of danger and intrigue.

As the narrative progresses, Yuki and Riku form an unlikely partnership, with Yuki gradually learning to harness his own abilities and confront his insecurities. Along the way, they encounter other individuals with unique powers, some of whom become allies while others pose significant threats. The story explores themes of self-discovery, friendship, and the struggle to overcome personal limitations, all set against the backdrop of a high-stakes conflict involving hidden powers and shadowy adversaries.

The manga balances action-packed sequences with moments of introspection, as Yuki's growth is central to the plot. Riku serves as both a mentor and a foil, pushing Yuki to confront his fears while grappling with his own vulnerabilities. The dynamic between the two characters drives much of the narrative, as they navigate their evolving relationship and the challenges they face together. The series also delves into the moral complexities of power and responsibility, as Yuki and Riku are forced to make difficult choices that test their values and resolve.