Decades ago, in my childhood and youth, my family spent two or three weeks every summer at the family cottage, then owned by my paternal grandfather. And a big feature was that it was on a decent-sized lake in Central Ontario where we could swim, fish, boat, etc.
During that same era, I was interested in what are now called "cryptids". Things like the Loch Ness Monster and Bigfoot. So, naturally, we started jokingly talking about the "xx Lake Monster" living in our lake.
Since cryptids are a common and fairly significant modern mythology, I thought a story that ran with that idea could be fun for the comp. I went dark (hey, it's me) and mixed a bit of kaiju (i.e. Japanese monster movies like Godzilla, another significant modern mythology) in just for added fun and darkness.
So, I give you ... The Summer Beast