Founded in 2024, SEASAR is a Japanese stationery brand created by Seasar (Shisa), a stationery enthusiast and YouTuber whose "Shisa Stationery Channel" has attracted over 1 million subscribers since its launch in 2014. After years of reviewing hundreds of writing instruments, Seasar set out to create his ideal mechanical pencil, leading to the development of the Aero Maximum Rigidity Mechanical Pencil—the brand's first product, completed after two years of development. Guided by a commitment to quality, durability, and timeless design, SEASAR continues to create thoughtfully crafted stationery and everyday carry items designed for long-term use.