Rather than holding the bottle with the ring towards you and pulling up, it is easier to open it with the ring facing away. Use your finger to pull the ring up and towards you (as shown in the illustration left).
ORONAMIN C DRINK
Hold the bottle with the ring facing away from you, and pull the ring up and forward.
The opening method is written in Japanese on the side of the cap.
An illustration of how to open the cap is shown on the top of the 10-bottle package.
The same type of cap is used for ORONAMIN C ROYALPOLIS, Fibe-Mini,
FIBE-MINI PLUS, SOYSH, and Amino-Value CONC.
Click here for a video of how to open the bottle (in Japanese only).