Seinen music is not a recognized genre in the sphere of music but rather is associated with a category of anime and manga targeted at young adult men, typically between the ages of 18 and 40. The term "seinen" itself means "young man" or "adult man" in Japanese. Bearing this in mind, and looking at the artists and characters provided, which are often connected to voice actors and fictional characters from anime, it seems the description is referring to a niche category of music characterized by its connection to seinen anime shows. This music often accompanies series with more sophisticated or mature themes, including action, politics, psychological dramas, and slice-of-life stories. The soundtracks and songs produced for these shows by the artists listed typically aim to enhance the emotional depth and thematic complexities of the anime they accompany, offering a range of sounds from high-energy openings to moody character themes that resonate with the more adult-oriented storytelling of seinen narratives.

恋しちゃった！ - GameApp「SHOW BY ROCK!! Fes A Live」

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Single - Released September 30, 2022