Quitting my Japan job without another lined up — bad idea?

I’m currently working in Japan on an Engineer/Specialist in Humanities/International Services visa. My job feels like a complete dead end — boring, no room for growth, and honestly I’m doing nothing 90% of the time. I’m seriously considering quitting even though I don’t have another job lined up.

My situation:

• My wife also works here on the same visa type.

• Her salary is enough to support us for the meantime.

• My plan is to look for a new job right away, but if I can’t find one in time, I’ll switch to a Dependent visa under her.

My concern is:
• Is quitting without something lined up in Japan a really bad idea?

• Will future employers look at this negatively (gap in employment + visa change)?

• From an immigration standpoint, is this safe as long as I switch visas in time?

Has anyone here done this? Would you recommend against it?

by Fortege