You may have problem such as
Encouragement to retire
and so on and two or more may be applicable in case.
In Japan, dismissal is under strict control, however, it actually occurs. Encouragement to retire is different from dismissal, however, it practically works similar situation with dismissal.
Also, company shall take proper actions against kinds of harassment, however, it results in collusion in some cases.
Furthermore, company may execute inappropriate changes in personnel under the mask of company's personnel right. But this can be said as a kind of harassment.
Matters of course, you can fight with company by yourself, however, you have limited resources and this is apparent that you are disadvantageous in view of power relationship.
So, please do think use of lawyer. Lawyer will provide legal advice about your problem and will make an effort to get your smile back and seek acceptable solutions for you by negotiating with company etc.
Basically, initial consultation is free of charge and on-line meeting such as Zoom etc. is available. Also, flexibly arrange meeting even weekend and evening as long as possible.
Don't take on worries alone, feel free to contact lawyer first.
If you are interested in reading some columns about labor issues etc., please click below.