comfort zone
Refers to a physical or psychological area where one feels safe, at ease, or comfortable. Often used in contexts of personal space, habits, or social situations.
彼は自分の快感帯から出たがらない。
He doesn't want to leave his comfort zone.
新しいことに挑戦するには、快感帯を抜け出す必要がある。
To try new things, you need to step out of your comfort zone.