Rougo ni Sonaete Isekai de 8-manmai no Kinka wo Tamemasu  

Saving 80, 000 Gold in Another World for my Retirement, 000 gold coins in the different world for my old age, 老後に備えて異世界で8万枚の金貨を貯めます, Saving 80,000 Gold in Another World for My Retirement, เก็บเหรียญทองแปดหมื่นเหรียญไว้ใช้หลังเกษียณอยู่ค่ะ, เก็บเงินต่างโลก 8 หมื่นเหรียญไว้ใช้ยามเกษียณไงคะ

Kouha Mitsuha falls off a cliff, at which point she finds herself transported to some sort of medieval European fantasy world! While there, during a battle with some wolves that almost costs her her life, she realizes that she has the ability to come and go between Earth and this new world. Mitsuha decides to use this ability as much as she can. Why? To save up for retirement, of course! She sets her sights on saving eighty thousand gold coins--and this is the story of her schemes to get there!(Source: Sol Press)

Rougo ni Sonaete Isekai de 8-manmai no Kinka wo Tamemasu has been licensed in English as Saving 80,000 Gold in Another World for my Retirement by Sol Press.