UN:O is Seiwa Business's satellite office located in Otemachi, serving as a hub for broadcasting new concepts. As a space for connections that transcend organizational boundaries, it promotes collaboration with external partners and the creation of new projects. The office aims to be a place where a virtuous cycle naturally attracts interesting people, work, and ideas.


| Artist | David Seven, Chayapon Puapaiboonwong , m5, Watataku | デジタルアーキテクト(Digital Architect), Hiroki Oka, USB, HiiRO, Alvis lee |
| Period | 2025.10.17 -2026.10.17 |


UN:O is associated with the acronym for UNITE and the set symbols ∪ and ∩.
The letter O stands for Otemachi.
The pronunciation Yuno is derived from the English slang You know?, implying a sense of empathy and mutual understanding.
Making "working" more free and more creative.
While staying close to our customers' challenges, we work together to create new ways of working and workspaces.
https://seiwab.co.jp