The phrase seems to relate to the manga and anime "Shinseiki no Shonen and Shoujo" or more broadly could relate to concepts involving children of a new century and possibly themes of companionship or hanging out.
, an average high school "commoner" who is suddenly kidnapped by a mysterious organization. He is forcefully enrolled in Seikain Academy shinseki no ko to o tomari da kara eng extra quality
In the world of digital media and niche subcultures, these keywords serve specific technical purposes: The phrase seems to relate to the manga
As of this writing, the definitive “Extra Quality” English version is available through dedicated fan scanlation groups known for their high-fidelity scripts. Look for releases tagged with: shinseki no ko to o tomari da kara eng extra quality
: A child prodigy and mathematical genius who expresses herself through drawings and becomes very attached to Kimito. Extra Quality