I fear he might be a bit TOO into me[The false sun part 1]

Today we're checking out The Fale Sun, it's a visual novel I found on steam. When we were a kid we nearly drowned in a lake while staying with our grandpa and due to the trauma, forgot most of our time there and our parents never let us stay with him again. Now that we're old enough, we decided to go help grandpa on the farm but we run into a strange guy called Silus who claims we were best friends. Grandpa mysteriously gets poisoned and we spend most of our time with Silus, but the more time we spend with him, the weirder he starts acting