This is a swimsuit of "Imouto chan" drawn for the commemorable Comic Market 100 held at Tokyo Big Sight.
She is strolling down the beach in the middle of summer carrying "soramame" in a polka dot vinyl bag.
She's a cute but sassy girl, so it would be hard to get a lick of the pop'n shower soft serve ice cream she's holding. Unless you were to cast a special spell...