Usamatsu’s Glorious Life-Saving Purifier is a seal developed by a sealmaster named Usamatsu intended to remove unwanted gases from the air.
Repeatedly absorbs all gas within a 60-degree 3-metre cone in rapid bursts of suction. The gas goes into a storage space. Airlike gas is simultaneously expelled from the storage space via a separate identical cone. Anything not needed to produce the airlike gas (e.g. poison) remains trapped in the space.
Note that this seal merely removes substances from air. It does not add, so if your breathing has converted all the oxygen into CO2, the seal is not going to save you. Note also that Usamatsu had no idea about the proper chemical makeup of air, and just went with something that didn’t kill lab animals when they breathed it (in the short-term).
The seal switches between intake and outtake rapidly.[1]
Plot[]
The sealmaster that developed it, Usamatsu, got himself killed when the seal was destroyed, releasing all the poison. Everyone else also treated the name for the seal as a joke.
Hazo acquired the seal as part of a reward for capturing Arikada.[2]
When the team was in Snow, the purifier seal was used to remove smokes and ashes, therefore preventing the fire from revealing the position of Team Uplift.[3]
Noburi and Hazo used the purifier during the aftermath of an ambush that killed Minami and poisoned everyone present.[4]
Hazo designed a gas mask around the Usamatsu seal, even though it was weird and uncomfortable to use. At least it prevented him from being gassed.[5]