Xiaoyu Lei

Lei Xiaoyu is Sayo Shinoyama's escort, and an alleged 'butler-in-training' for the Shinoyama Clan.

Appearance
Lei is an adolescent with short black hair and a youthful face. He wears a long-sleeved top over striped shorts, sock garters, and black-fingered gloves.

Personality
When introduced, Lei presents himself as capable, eager-to-please, and humble. Underneath that pleasant demeanor, however, lies murderous anger toward the Polka imposter - and murderous intent toward the real Polka Shinoyama as well.

Chronology
In the immediate aftermath of the arson attack on the Shinoyama manor, the Shinoyamas assign Lei as Sayo Shinoyama's escort with orders for the two to move in with Sayo's uncle Polka. At face value, this move is largely innocuous: as the fire destroyed both Sayo and Polka's rooms, Sayo needs a place to stay. However, Lei appears to be no mere butler-in-training; he has orders from above to keep an eye on 'Polka' - or rather, the imposter posing as Polka.

Lei and Sayo arrive at "Polka's" - the Corpse God's - residence that night, and exchange introductions with Polka's roommates Takumi Kuruya and Misaki Sakimiya. On Sayo's behalf, Lei explains that Sayo's room was destroyed and procures a pre-recorded video from Rozan Shinoyama, in which Rozan requests that Polka allow Sayo and Lei to stay with him for the time being.

The Corpse God agrees, and Sayo and Lei spend the rest of the night in the living room (with Lei claiming that he is able to sleep on his feet). Sayo is still gloomy while Lei is chipper come morning, and Lei apologizes on Sayo's behalf to "Polka" and his friends after they file into the living room.

"Polka" asks Lei how he came to be Sayo's escort; Lei, as he sets a pan and portable stove on the table, claims he was chosen due to his name ("Xiaoyu") sounding similar to "Sayo." When "Polka" follows this with an inquiry into the welfare of the Shinoyamas, Lei cracks an egg into the pan and - after telling "Polka-sama" not to speak to deferentially - replies that the Shinoyamas are still busy dealing with the police.

As nighttime approaches, Lei and Sayo move into connecting rooms a floor below the others' main living space. Sayo claims the larger room while Misaki helps Lei carry a mattress inside, with Takumi and "Polka" looking on. Lei moves the mattress into the tiny side room, and bows deeply when the others bid him and Sayo good night.

Later, when Sayo is asleep, Lei sits upright on his mattress and activates a wireless listening device in his right ear. He successfully 'tunes in' to a conversation between "Polka" and Misaki (or Takumi): the interlocutor asks "Polka" what he plans to do with 'those two', and "Polka" mentions restarting fortune-telling the next day.

Smiling at his success, Lei clenches his fists and vows to expose "that damn Polka Shinoyama imposter" regardless of his master's decision to trust said imposter. He intends to eliminate the imposter if his master will not -- and then the real Polka, if he proves to still live.