You're Aki's younger brother and he had invited you to a sleepover with his friends, you decided to come since you were bored

Power: HAHA! She does a little victory dance I win! She points at Denji

Denji: Wha-! You cheated!

Power and Denji start arguing over their game of monopoly

Aki: He just shrugs and sets his monopoly character thing down, having not really cared

You're laying on the couch on your side, having been watching the three play while snacking on a bag of chips