Imagine that you are planning to buy a new wallet, and someone mentions that tomorrow is Ichiryū Manbaibi, a day commonly regarded as lucky. If there is no rush, you might think, “Then maybe I’ll just wait until tomorrow.”
For many people, the decision can be that casual.
Not everyone who pays attention to lucky days can explain exactly where Ichiryū Manbaibi comes from or how it differs from other calendar traditions. They may simply know that it is considered an auspicious day. If it also happens to fall on Taian, one of the most favorable days in the traditional rokuyō calendar, the date can feel even luckier.
There is not always any attempt to fit the two systems together logically. Taian is considered lucky. Ichiryū Manbaibi is also considered lucky. If they happen to coincide, the day simply feels a little more special. For many people, that is enough.
How much attention people pay to this varies a lot. Some actively check the calendar before choosing a date. Others barely think about it. Even someone who normally does not care much might delay a purchase by a day if there is no reason not to. A wallet is a good example. Someone might wait for Ichiryū Manbaibi, or hear that buying a wallet in spring is associated with good fortune and think, “Maybe I’ll wait until next month.”
Practical needs usually come first. If you need a wallet today, most people are not going to wait a week just because the next lucky day has not arrived yet. But if tomorrow happens to be Ichiryū Manbaibi and there is no hurry, waiting one more day can feel perfectly reasonable.