Buddhist thought does not say there is no self. It says our conventional, intuitive understanding of the self, is incorrect and misleading. Specifically because, we intuit that we don't change, and that our minds are independent of our surroundings. Anatta means no persistent unchanging self, no essence, no permanent self. I would compare the ontology of Buddhist thought to the view of the self in physicalist-materialism: ultimately the self is not a substance with an unchanging centre, but a set of dynamic processes. See the metaphor of Indra's Net for how lack of essence or unchanging identify, relates to mutually-dependent arising, or interbeing.
China has a different emphasis than Indian thought about the individual, mainly because of Confucian thought. See Individualism in Classical Chinese Thought.
There are some indications that Chinese and Japanese people tend to think of the family or group ahead of the individual, described academically as difference in cultural orientation in locus of control. However, there is evidence of substantial variation eg Collectivism's individualism: Value preference, personal control, and the desire for freedom among Chinese in Mainland China, Hong Kong, and Singapore.
Jonathan Haidt with his moral foundations theory identifies broad differences in culture between primarily pastoral and primarily agrarian communities, as tending to contribute to different moral tribes now: pastoralists like US cow herders, Afghan hill tribes, etc. as founded on protecting a herd that stores wealth through threat-posturing; vs agrarian cultures like the lentil growers, of Gobekli Tepe, river valleys of Mesopotemia and Egypt, and rice-growing regions, as shaped by the need to sow and harvest together above all. Individualist vs collectivist, left vs right.
It is notable that Tibet and Mongolia, cultures where they almost entirely relied on grazing animals, yet inherit Mahayana Buddhism, place different emphasis on the teachings. Tibetan Buddhism places a lot of emphasis on initiation into secret teachings. Mongolian Buddhism is full of violent threatening deities to enforce moral behaviour.
We discussed the accusation of solipsism in regard to Buddhism directly here:
Different between Buddhism and Solipsism
In Japan my advice would be, pay close attention to manners, and the details of how people behave. Having extremely clean feet & socks is very important where people take shoes off indoors, and personal hygiene is about considering others more than reflecting on you. If people give you presents, find a way to give something of equal value back. Blowing your nose with any noise, is not ok. In China and Japan wearing a mask when you have a cold, to protect others, is considered essential care for others. Generally the cultural differences are not so great, particularly in cities. And just like here, most people aren't much impacted by the details of philosophical traditions.