Green Flash is a Japanese brand known for its thoughtfully designed stationery, paper goods, and lifestyle items, often created through collaborations with illustrators and creative series. One of its most popular collections, Study Holic, celebrates the beauty of science and intellectual curiosity, featuring themes such as astronomy, biology, chemistry, and mathematics. The series transforms scientific diagrams, instruments, and academic motifs into beautifully illustrated stationery and goods—from notebooks and memo pads to stickers and zakka—bringing a distinctive charm to everyday life.