Description

You, the protagonist, coincidentally stumble upon:

Your mean-spirited childhood friend
Or
Your kind, but overbearing older brother

"Playing with himself".
To top it off, they were doing so whilst fantasising about you, and...

"Y-You're wrong! It's not what it looks like!!"

...This is a love story that begins from a slightly awkward situation.

[Translation of official website's story summary.]