Ganbaru Kimi to no Futari Gurashi: Iede Gal Icha Love Seikatsu SLG

Overworked with overtime every single day, only coming home to sleep.
The protagonist, who feels no hope in his daily life, begins living together with a runaway gal named "Kaede."
In exchange for letting her stay, the promise she proposed was "to cheer up the old man."
Through her devoted support, he gradually regains his energy.