Unazukin is trying to have a picnic and is being bothered by flies, bugs and snails. Using your mouse - that's computer mouse not an actual mouse - you must save the meal from these creeping crawlies by dragging them to be eaten by a fat frog... or a spindly spider...
As you progress the flies and bugs are "upgraded" to snails and wasps who seem to be breeding like rabbits... very confusing...

Well not really, once you read the instructions you’ll suss it in to time but take note the most important instruction directs you to the bottom right corner where you’ll find the sound off button... and relax