Start from the East exit of Ikebukuro station.
Walk along Meiji dori towards Oji. Pass the following landmarks: BIC Camera, Yamada Denki, MOS Burger until you reach a huge intersection (Mutsumata Kosaten) with a highway overpass. Cross that intersection and keep walking along Meiji Dori for about another 50 meters until you reach a small convenience store.
Osada-ryu / Studio SIX
10F, BIG Office Plaza