noun
inner world; one's world within
Refers to a person's internal psychological or emotional landscape, as opposed to the external world. Often used in literary or psychological contexts.
彼の小説は、登場人物の内面世界を深く描いている。
His novel deeply depicts the inner worlds of its characters.
瞑想を通じて自分の内面世界と向き合う。
Through meditation, I face my own inner world.
Compound of 内面 (ないめん, 'inner side/self') and 世界 (せかい, 'world'). The term is a straightforward combination of these elements.