Midori Connectiong Pen Join Liner (Modular 0.3mm Fineliners for Journals)

The Midori Connecting Pen Join Liner is a innovative modular fineliner series launched by the Japanese stationery brand Midori. It is specifically designed to support journaling, meticulous planner layouts, and the "Commonplace Book" system (where information is heavily color-coded by category for easy reference).
The defining trait of the Join Liner is its modular, interlocking design alongside an ultra-precise needle tip.
 

Key Features & Design

• Modular "Join" Ecosystem: The individual pen units feature a block-toy-like puzzle mechanic. They can snap tightly together either horizontally (side-by-side) or vertically (end-to-end). This lets you assemble your favorite custom color palette into a single solid unit that easily slips into a pocket or bag without needing a bulky pencil case.
• Ultra-Fine Precision Nib: Unlike typical thick highlighters or markers, it is outfitted with a sharp 0.3mm fine needle tip. This is engineered for micro-journaling, writing tiny text in compact planner grid boxes, tracking habits, and detailing sketches.
• High-Quality Japanese Ink: It utilizes smooth-flowing, water-based dye ink formulated to minimize bleeding and feathering, ensuring crisp lines even on delicate planner papers.