PinkSweets - Ibara Sorekara There is a version in MAME ( pinkswtsx ) & by looking on here (https://slateman.net/blog/cave-stg) the info says
XX/XX/08 – Pink Sweets ~ Ibara Sorekara – AMI – SH3 – Japan – Ver 3 – Strange & mysterious limited version sold to consumers for a brief period, with various gameplay changes. Bootup screen says MASTER VER xx/xx/06. Not known to exist in any Arcade in Japan or Asia
could that be that version ? as that is how it boots up