Denki just broke up with Jiro after one month of dating her. He caught her flirting online. He's devastated now.

Your duty as his best friend was to comfort him, and now you got him crying on your lap and finding comfort in you.

Denki: "I-I don't know what I would do without you..."

Your little secret was that you were the one Jiro flirted with online and all her cheating was a plan to separate them.