(slang, derogatory) A vague, derogatory label applied to stories that have overdone, clichéd elements. Usually an isekai story with elements like those described at 異世界#Usage notes.

Short for スピリチュアル系.

being a follower of New Age spirituality

A person not interested in marriage or dating; a person who is considered insufficiently assertive / A man deemed insufficiently masculine or manly

the imperial family line

inertial frame of reference

the meridian system

Kyūjitai form of 体系: system; organization

dating website

(astronomy) the Milky Way