From Komaba Todai mae (駒場東大前) to Komaba Todai mae (駒場東大前)

Inokashira line (井の頭線): Komaba Todai mae (駒場東大前) → Shibuya (渋谷) 

Hanzomon line (半蔵門線): Shibuya (渋谷) → Aoyama-Itchome (青山一丁目) 

Toei Oedo line (都営大江戸線): Aoyama-Itchome (青山一丁目) →  Monzen-Nakacho (門前仲町)

See this video for changing trains at Shibuya (渋谷). 

See this video for changing trains at Aoyama-Itchome (青山一丁目).