Doma Residence, secret room.
"Why did you make plans with Kato? Why..." Sogo Doma couldn't understand what his foolish little sister was thinking. Even though she knew... Well, she didn't know anything.
"Huh? Because Kato said she always spent her vacations alone..." Sure enough, Umaru Doma didn't feel she had done anything wrong at all. She even said, "Onii-chan, does that mean Umaru can't invite her friends over to play anymore...?"
"No..." Sogo Doma's expression stiffened. "That's not what I meant. What I meant was, I meant..." He wasn't the kind of Onii-chan who controlled his little sister.
"Hm?"
"I mean, how could Kato possibly spend her vacations alone? Her parents..."
"Oh..." Before Sogo Doma could finish, Umaru responded in a tone of realization. Then she explained, "Megumi's family left for a family trip yesterday, leaving her alone to watch the house..."
"Huh?"
"I'm telling you, they called it a family trip, but Megumi's parents completely ignored her existence and only took her older sister. That's why Umaru invited Kato over!"
"..." Sogo Doma's eye twitched. Her parents were really absurdly careless. Still... "You should've told me that earlier!"
"Because I forgot about the plans I made with Megumi too..." Umaru said, sticking out her tongue.
"You could forget something like that?"
"Um..." Umaru nodded, then explained, "But you can't blame Umaru for that. Onii-chan was playing games so seriously that Umaru's attention got completely drawn into the game, so..."
"So it's my fault?"
"Emmm..." After thinking for a while, Umaru actually nodded. "You could put it that way..." Sogo Doma: #^_^
"You'd be better off blaming Kato for being too forgettable!"
"Ah, um..." As soon as he said that, Umaru suddenly looked embarrassed. "Um, actually, it isn't just Kato. I-I also made plans with Ako and Eriri..."
"..."
"Well,