The New, Improved Triangle Notebook by Tan Mavitan
Triangle Notebook - Dark Amber
So a while ago I asked about anywhere that may sell a triangle notebook similar to St. Germain's from the anime. My mum then made me one for my birthday!! : r/castlevania
P34-PH Notebook Triangle S (Plain) – Labrador Factory Philippines
Triangle Notebook Üçgen
Slice: A notebook in the shape of a triangle. "We've attempted to change everything while changing nothing" : r/shittykickstarters
Triangle Notebook - COOL HUNTING®
Triangle Notebook - Benzersiz Tasarım - Kumaş Sert Kapaklı Üçgen Defter (Siyah) : Amazon.com.tr: Ofis ve Kırtasiye