Confidentiality letters and non-disclosure agreements are commonly used. However, separate exclusivity agreements are less common, as exclusivity is typically dealt with in the term sheet or preliminary agreement. Break fees are not commonly used in private acquisitions.
Broad duties to act in good faith apply to the parties. Accordingly, any failure to reach a definitive agreement caused by bad faith behavior could create legal liabilities, although Japanese courts will make such determination on totality of facts and on a case-by-case basis.