This is the full Japanese Spider-Man Series, Stream free and download LEGALLY straight from internet archive.

“Spider-Man (スパイダーマン Supaidāman) is a Japanese live-action tokusatsu television series produced by Toei Company, loosely based on Marvel Comics's Spider-Man character. The series lasted 41 episodes, which aired on the Wednesday 19:30 JST time slot of Tokyo Channel 12 (TV Tokyo) from May 17, 1978, to March 14, 1979. A theatrical episode was also shown in the Toei Manga Matsuri film festival on July 22, 1978.

While Toei's version of the character wore the same costume as his Marvel counterpart, the show's storyline and the origin of the character's powers deviated completely from the source material. In addition to fighting by himself, this incarnation of Spider-Man also piloted a giant robot known as Leopardon, which he would summon to thwart off enlarged versions of the show's monsters.” - u/Anarchivism