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Ichi Ni no San," performed by Penthouse, serves as a vibrant music video that complements the lively energy of the anime *Mairimashita! Iruma-kun* in its fourth season. The visuals are a dynamic blend of colorful animation that captures the essence of the series while engaging viewers with rhythmic beats and catchy melodies.

As the opening theme, the song sets a spirited tone for the episodes that follow, inviting audiences to dive into the whimsical adventures of the characters. The interplay of music and animation creates an engaging experience, perfectly aligning with the anime's lighthearted yet captivating narrative style.