Yes, you can always drop by during our office hours to return the items.
Address: 〒160-0023 OG INC. Otakibashi Pacifica Bld. 9th Fl. 7-10-18, Nishishinjuku, Shinjuku-ku, Tokyo
Operation Hours and Map: https://goo.gl/x9f9wP
The building where our office is located between Lawson and Seven-Eleven convenience store.
On the first floor, there's Ichiran Ramen.