[Tentative blurb, not finished yet]
You open a post-apocalyptic game. You happily start farming. You find a child with amnesia. You begin your daily life raising the child.
"The kid likes tomatoes? Quick, plant the whole field!"
"Someone bullied the kid? Quick, get revenge!"
"The kid says he likes me? Quick, let me... Huh?!!"
Mo Mo is always hopelessly absorbed in cuddling the kid, until the child she raised herself confesses his love for her and scares her so much she drops her phone.
Before meeting Mo Mo, Si was constantly struggling in despair.
After meeting Mo Mo, Si grew up nurtured by her love.
Full of joy, Si went to tell Mo Mo how he felt, only to find she'd disappeared.
A day, a month, a year... In the third year since Mo Mo vanished, Si went mad.
Mo Mo, unable to log in because the game was updating for three days: ...This trash game ruined my kid!
Theme: I only wanted to farm and raise a kid, so how did I end up playing a dating sim?