100 Yen Stores near Shinjuku

Hi Everyone,
I'll be staying at the Kadoya Hotel. Can you please tell me where the 100 Yen stores are near there?
Thanks.

Kadoya Hotel locates in Shinjuku West. There is no 100 Yen shops there around.
You need to go to the south east side of Shinjuku which is 15 mins walk.
There is a 100 Yen shop called "Seria" in Shinjuku Marui Annex 4F.
The other 100 Yen shop is called "Can Do" which locates in Seibu-Shinjuku PePe 8F.

At so-called 100-yen shops, most items are available at 100 yen (before tax) per package, while there may be some items sold at around 200 yen.

[Can do]

A shop of Can Do is on the 8th floor of Seibu-Shinjuku PePe, which is forming the complex of Seibu-Shinjuku Station and located to the north of (JR) Shinjuku Station.
This Can Do shop is open from 11:00 to 22:00.
It is about 950 meters on foot from the entrance of Kadoya Hotel to the entrance of Seibu-Shinjuku PePe.
https://www.google.co.jp/maps/dir/35.6898107,139.6963005/35.6894894,13...

[Daiso]

Daiso shops in Shinjuku City are rather small.
The largest shop of Daiso in Tokyo is the one on the 7th floor of Arcakit Kinshicho, which is a shopping center located near (JR) Kinshicho Station in Sumida City.
This Daiso shop is open from 10:00 to 21:00; its shopping area is about 3000 square meters.
From the entrance of Kadoya Hotel, you can walk for about 600 meters to the west ticket gate of (JR) Shinjuku Station.
https://www.google.co.jp/maps/dir/35.6898107,139.6963005/35.6894894,13...
Then you can take a Local train departing at Track 13 (bound for Chiba or Tsudanuma) for about 25 minutes to Kinshicho Station, go out to the north exit and get to the neighboring Arcakit Kinshicho. The one-way JR fare is 220 yen per adult passenger.