ONPO bath additives and MegRhythm steam eye masks are two different self-care formats in YUBI100’s current inventory. ONPO has three in-stock 20-tablet bath options at ¥550 each, while MegRhythm has four in-stock 12-sheet eye-mask options at ¥980 each. This comparison lists verified formats, scents, SKUs, prices, and stock without making performance claims.
| Key information | ONPO | MegRhythm |
|---|---|---|
| Format | 20-tablet bath additive pack | 12-sheet steam eye-mask pack |
| In-stock options | 3 | 4 |
| Price | ¥550 each | ¥980 each |
| Current stock | 38 units | 50 units |
| Product page | View ONPO | View MegRhythm |
Seven in-stock options
| Brand | Option | Pack | SKU | Price | Stock |
|---|---|---|---|---|---|
| ONPO | Yuzu | 20 tablets | 30159 | ¥550 | 19 |
| ONPO | Rose | 20 tablets | 30160 | ¥550 | 9 |
| ONPO | Forest | 20 tablets | 30161 | ¥550 | 10 |
| MegRhythm | Unscented | 12 sheets | 25130 | ¥980 | 10 |
| MegRhythm | Lavender | 12 sheets | 25131 | ¥980 | 10 |
| MegRhythm | Yuzu | 12 sheets | 25133 | ¥980 | 20 |
| MegRhythm | Forest Bathing | 12 sheets | 25134 | ¥980 | 10 |
Format and price comparison
The two product groups are not substitutes in form. ONPO is sold as a bath additive, while MegRhythm is sold as individually used steam eye masks. The verified store prices differ by ¥430 per pack: ONPO is ¥550 and MegRhythm is ¥980.
Earth Corporation’s current official ONPO pages identify the Yuzu, Rose, and Forest lines as 20-tablet packs. Kao’s official product information identifies the corresponding MegRhythm options as 12-sheet packs. The store’s product name retains “steam hot eye mask,” while Kao renamed the current Japanese line “Steam Circulating Eye Mask” in 2025; this comparison follows the Shopify option names and does not assume a formulation change.
Stock notes
The seven compared options total 88 units in current inventory. ONPO Yuzu has 19 units, ONPO Rose has 9, and ONPO Forest has 10. MegRhythm Unscented, Lavender, and Forest Bathing each have 10 units; MegRhythm Yuzu has 20.
Three MegRhythm options listed on the same Shopify product page—Osmanthus, Chamomile, and Hinoki—are excluded because their current inventory is zero. Stock can change after this article is published.
What this comparison does not claim
No direct-use notes were supplied. This article therefore does not rate aroma, warmth, comfort, duration, skin feel, or effectiveness. It also does not infer ingredients or performance from similarly named products. Selection here is limited to verified format, option name, pack count, SKU, price, and current stock.
Change log
September 28, 2026: First publication. Prices, SKUs, pack formats, option names, and inventory were checked against the active Shopify products; official Earth Corporation and Kao sources were used to confirm product formats. Next scheduled review: December 2026.