Good news: she is legal Bad(?) news: she is someone's grandma
Hey, older people are more matured.
Huh? You guys are here already?I'm home~Wot?Big sis?I don't have one though...? I have always been the only child...Don't play dumb! Just now, there's this girl wearing red kimono...Gran-Kimono...?
...Ahh...*Rattling door sounds*Tmp tmp tmpThat person is not my sister or anything like that...I'm going to bring out some tea so make yourselves at home!Are you boys his friends?Oh my?I'm sorry, but he's not home at the moment...
Feel free to come in and wait for him inside!Y-you! I thought you were the only child!I'm sure he will be back soon, so...You have a big sister that beautiful and yet never told us anything!She is our grandma.Seems that she is a 'ship-girl' still on active duty? Or something like that...Ever since that day, he was given the nickname "Zashiki-warashi's grandson" and it stuck.