Design 10 short-form hooks and CTA variants for Shinjuku City commuters (JA/EN). Channels: X, Instagram Reels, LINE. Include peak posting windows (07:00–09:00, 18:00–21:00 JST), station-area keywords, and an A/B matrix. Output predicted engagement ≥70% via CTR>3.5%, watch-through>45%, save/share>8%.
