To open a bottle of Kikkoman soy sauce, first, grab the bottle tightly in your non-dominant hand. With the other hand, twist the top to the left in an unscrewing motion. Some bottles are particularly challenging to open so you may need a towel or rubber grip for traction. It's a funny shaped lid.
Cut the nipple off flush with the top of the cap. There is no mechanism to reseal it. Use the knife cut the blue cap. Tophouse. You need to cut off small part on top of the plastic cap with the knife and keep it open and refrigerated. There's a hole on the cap and squirts out when you hold the bottle upside down.