https://j.mp/2Tt0CDQ #MAT2021 https://j.mp/3uBqUAv

aki

4年前

https://t.co/nNC6Wkw26V #MAT2021 pic.twitter.com/I9fA8AfcX2

— Dr.(Shirai)Hakase #StayHome🦠 (@o_ob) May 31, 2021

from Twitter https://twitter.com/o_ob