What is vertical's fastest manga book to sell out completey?

[Vertical Inc]

What is vertical's fastest manga book to sell out completey?

Well, this is a weird question… Cause selling out completely means going OOP. And generally speaking if a title sells very quickly it will not go OOP.
Chi’s Sweet Home 1 and Gundam the ORIGIN 1 both sold out their first printings very quickly (in about 6-7 weeks). Both have seen multiple reprints though.
A book that went OOP quickly was Twin Spica 11. Libraries and a certain comic shop in Boston ordered a good chunk of this volume once we announced the series was going OOP. I think this was in stock for only half a year or so.