Is it normal to date cousins in Japan?
Depends.It depends
It can happen, but reactions in Japan vary by family and community. Dating a cousin may feel unusual to some people and be no big deal to others.
There isn’t one Japanese rule about how people should feel about cousin dating. Some families may find it awkward or unusual, while others may not mind. Dating is also different from deciding to marry; first-cousin marriage is legally allowed in Japan.