If you turn this series into a graph, you will see a line going up for a short while before it plateaus until the last episode.

17-year-old (almost 18) Shin is in love with Akira, a man about ten years older. Shin is totally Akira's type, but of course, the age gap and the fact that Shin is not even 18 yet stops Akira from accepting Shin's love. Of course, there isn't really a big issue if nothing happens between them until Shin has turned 18.

Perhaps Akira's attraction to Shin is toned down drastically to avoid controversy, causing his reactions to Shin's advances to seem somewhat silly. But to avoid controversy, why not just start the story with Shin meeting Akira after he has turned 18? The age gap could hold Akira back, but there probably won't be a major ethical issue there.

Instead, the story meanders here and there, even revealing Akira's crush on his teacher when he was a high school student. The turns in the plot are largely pointless, and I think the only significant thing is Akira deciding not to be with Shin so that Shin can pursue his studies elsewhere.

Perhaps the series would have been better if it had only been 4 episodes? The characters are rather cute, but the story drags on needlessly.