"Happy Lucky Bikkuriman" is a fantasy-adventure anime series centered around the Bikkuriman, a group of mystical beings who protect the universe from evil forces. The story unfolds in a world where the Bikkuriman, led by the heroic Bikkuri Titan, battle against the malevolent Maou and his army of demons. The conflict arises from Maou's desire to conquer the universe and plunge it into darkness, while the Bikkuriman strive to maintain peace and harmony.

The protagonist, a young boy named Taro, becomes entangled in this cosmic struggle when he discovers a Bikkuriman sticker that grants him the power to transform into a Bikkuriman warrior. Alongside his friends, Taro embarks on a journey to collect more stickers, each of which bestows unique abilities and summons powerful allies. These stickers are scattered across various dimensions, requiring the group to travel through different worlds and face numerous challenges.

Throughout the series, Taro and his companions encounter a diverse cast of characters, including other Bikkuriman warriors, each with their own distinct personalities and powers. The narrative explores themes of friendship, courage, and teamwork as the group works together to thwart Maou's plans. The stakes escalate as Maou grows stronger, forcing the Bikkuriman to unlock new abilities and strategies to counter his threats.

The plot is episodic in nature, with each episode typically focusing on a specific mission or battle, while also contributing to the overarching storyline. The series balances action-packed sequences with moments of humor and character development, creating a dynamic and engaging narrative. As the story progresses, the characters face increasingly difficult trials, culminating in a climactic showdown between the Bikkuriman and Maou's forces.

"Happy Lucky Bikkuriman" is characterized by its imaginative world-building, vibrant character designs, and a blend of lighthearted and intense moments. The series appeals to a younger audience while also offering elements that can be appreciated by older viewers, making it a versatile addition to the fantasy-adventure genre.