Address:
3-23-1 Hyakunincho, Shinjuku-ku, Tokyo 169-0073

From Narita Airport:

By train

Narita Airport (N'EX)→Tokyo Station or Shinjuku Station (JR Yamanote Line)→Shin-Okubo Station (JR Yamanote Line)
Narita Airport (Narita Sky Access)→Nippori Station (JR Yamanote Line)→Shin-Okubo Station (JR Yamanote Line)

By bus

Narita Airport (Limousine Bus)→Shinjuku Station (JR Yamanote Line)→Shin-Okubo Station (JR Yamanote Line)

From Haneda Airport:

By train

Haneda Airport (Tokyo Monorail)→Hamamatsucho Station (JR Yamanote Line)→Shin-Okubo Station (JR Yamanote Line)

By bus

Haneda Airport (Limousine Bus)→Shinjuku Station (JR Yamanote Line)→Shin-Okubo Station (JR Yamanote Line)