noun, noun which may take the genitive case particle 'no'
right behind; directly behind
Emphasizes the position exactly at the back of something, with no gap or offset. Often used with に or の.
He was standing right behind me.
I sat in the seat directly behind.
真正面 is directly in front of something, while 真後ろ is directly behind it.
真後ろ means 'directly behind', the exact opposite direction from 真ん前 which means 'directly in front'.
Standard kanji spelling.
Kana spelling is common in informal writing or when avoiding kanji.
Compound of 真 (ま, 'true, exact') and 後ろ (うしろ, 'behind'). The prefix 真 intensifies the positional meaning.