Repeat/loyalty purchase
A large share of reviews explicitly mention repurchasing multiple times ('リピート', '回購', '6th repurchase') and buying alongside the brand's shampoo and treatment as a full routine.
Word-of-mouth and gifting
Several buyers say they were recommended the product by a friend or bought the double pack to share with a daughter, mother or sister.
Scent variety and collectability
The double pack format (e.g., Tender Bloom + Cherry Blossom/Warm Petal) encourages buyers to purchase to try or stock up on limited seasonal scents like sakura.
Perceived premium value vs. luxury brands
Multiple reviewers compare it favorably to high-end brands like Kerastase, citing similar or better results at a lower price.
Sample-to-full-size conversion
Several customers tried a mini/travel-size or sample version first and then purchased the full 70ml size after being satisfied.