From Komaba Todai mae (駒場東大前) to Etchujima (越中島) 

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

Yamanote line (山の手線): Shibuya (渋谷) →Tokyo (東京) 

Keiyo line (京葉線): Tokyo (東京) → Etchujima (越中島) 

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

See this video for changing trains at Tokyo (東京).