「Adjectives and Adverbs」
The particle noni when used as a conjunction, indicates a state that is followed by a result contrary to expectation. If the predicate of the main clause (the clause following noni) is past tense, the tense of the noni clause (the subordinate clause) may be either present or past tense.
Kare wa atama ga itai noni kusuri o nomanai.
Although he has a headache, he doesn't take medicine.
Sakana wa atarashikatta noni oishiku nakatta.
Although the fish was fresh, it didn't taste good.
Sono michi wa yoru demo anzen'na/ anzen datta noni dare mo tōranakatta.
Although the street was safe even at night, no one passed along it.
Hope this helps!
°˖ ✧◝(○ ヮ ○)◜✧˖ ° こゆうきあいはら °˖ ✧◝(○ ヮ ○)◜✧˖ °