"Do It Yourself!!" centers around a group of high school students who come together to form a DIY club, driven by their shared passion for creating and building things with their own hands. The narrative explores their journey as they tackle various projects, from simple repairs to ambitious constructions, learning valuable skills and life lessons along the way. The protagonist, a determined and resourceful student, takes the lead in organizing the club, often inspiring her peers with her enthusiasm and creativity. Each member of the group brings unique talents and perspectives, contributing to the collaborative spirit that defines their endeavors.

The series delves into the challenges the students face, both in their projects and in their personal lives. Balancing schoolwork, friendships, and their DIY ambitions, they encounter setbacks and moments of self-doubt. However, through perseverance and teamwork, they overcome obstacles and grow individually and as a group. The narrative emphasizes the importance of problem-solving, resilience, and the satisfaction of creating something tangible.

Key characters include the protagonist, whose leadership and vision drive the club forward; a meticulous and detail-oriented member who excels in planning and precision; a creative and artistic student who adds flair to their projects; and a more reserved member who discovers confidence through participation. The interactions among the characters highlight themes of camaraderie, mutual support, and the joy of shared accomplishments.

The plot unfolds through a series of episodic challenges, each focusing on a specific project or goal. These range from building furniture and repairing school facilities to crafting personalized gifts and participating in community events. The series also touches on the broader impact of their work, showcasing how their efforts benefit their school and local community. Through their experiences, the students learn not only practical skills but also the value of hard work, creativity, and collaboration. The narrative maintains a lighthearted and uplifting tone, celebrating the rewards of hands-on creation and the bonds formed through shared endeavors.