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

a nervous system

Alternative form of ヴィジュアル系 (vijuaru-kei)

that which can warm one's heart, calm one's mind and provide comfort in times of sadness

dynamical system

Short for スピリチュアル系.

being a follower of New Age spirituality

(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.

an immune system