"Ore, Twintail ni Narimasu. Pai" is a manga adaptation of the light novel series "Gonna be the Twin-Tail!!" by Yume Mizusawa. The story centers on Soji Mitsuka, a high school student with an intense passion for twintails, a hairstyle he considers the pinnacle of beauty. His life takes an unexpected turn when he encounters a mysterious girl named Tail Red, who is battling alien invaders known as the UPG. These aliens, led by the enigmatic Aika, seek to drain Earth of its "Attribute Power," a mysterious energy tied to human traits like hairstyles, fashion, and hobbies.

To combat the UPG, Soji is recruited by Twoearle, a being from another dimension, and given the ability to transform into Tail Red, a powerful warrior whose strength is directly tied to his love for twintails. Despite initial reluctance, Soji embraces his new role, using his passion to fuel his combat abilities. Alongside him is his childhood friend, Tsube Aika, who also gains the ability to transform into Tail Blue, another warrior fighting the UPG. Together, they form a team to protect Earth from the alien threat.

The narrative explores the dynamics between Soji, Aika, and other characters who join their cause, including Tail Yellow, a third warrior with her own motivations. The story balances action-packed battles with comedic and lighthearted moments, often playing on Soji's obsession with twintails and the absurdity of the premise. The UPG's attacks are tied to specific human attributes, leading to creative and often humorous confrontations that test the heroes' resolve and creativity.

As the series progresses, deeper layers of the conflict are revealed, including the origins of the UPG and the true nature of Attribute Power. The characters face personal challenges and growth, with Soji grappling with his identity as a warrior and his feelings for those around him. The manga maintains a focus on themes of passion, identity, and the power of embracing one's unique interests, all while delivering a mix of action, comedy, and occasional heartfelt moments.