Kosuburo Hajimemashita!!

Hajime is a university student. One day, he starts investing in the stock market and successfully earns a lot of money. But Michiru, his childhood friend, accidentally loses almost all of his money in one night while gambling... She feels guilty and makes a suggestion, "You take a photo of me in cosplay uniform and sell it to make up for the loss." Hajime thinks she doesn't need to do it, but Michiru never takes it back. He finally accepts her suggestion, and like this, his strange summer starts....