How Copywriting Determines Startup Success: Sasaki Keiichi on Taglines That Move Markets

Copywriter Sasaki Keiichi joins Tadokoro Masayuki to show how a single phrase can align teams, create new market categories, and double conversion rates.

• Sasaki’s ‘combination method’ (合体法): fusing two unrelated words creates new categories — ‘convenience store + gym’ became Chocozap, ‘gap + part-time job’ became Timee.
• Chocozap used ‘convenience store gym’ to manufacture a new market; within two years it surpassed established chains like Fast Fitness Japan in number of locations.
• For Horie Takafumi’s acquisition of Cross FM Fukuoka, Sasaki wrote ‘Let’s do a grand experiment with radio waves’ — the phrase became a programming filter that killed safe proposals and greenlit a Gashi-hosted show.
• Startup job platform Stacle (スタクラ) saw 2.5x registration rate after a January 2025 ad campaign featuring Horie with deliberately non-smiling urgency copy and handwritten font to force a slower read.
• One Stacle train-door ad read ‘Startup Class, what a lame name’ — deliberate self-deprecation designed to make the brand name stick through Horie’s mock criticism.
• Tadokoro argues the worst startup failure is slow decision-making; a sharp single phrase accelerates decisions by giving every proposal a clear pass/fail filter.
• Sasaki recommends one phrase over mission-vision-values frameworks: employees rarely memorize three statements, but a single north-star line can run every meeting.

2025-10-24 · Watch on YouTube