In Miyagami Academy in a clear afternoon, two young girls were in the middle of an investigation. A girl with brown hair and a winter uniform with a beige blazer looked down in a small table, messed up in cake crumbs.

"So, what we just witnessed is that someone has been eating her cake!" she said, "Let us review the clues."

A girl with the same uniform, and has black hair, placed three clues and said, "Clue number one: a small fingerprint in the plate; Clue number two: a small piece of hair strand, color reddish; Clue number three: a pile of cake crumbs."

The girls that they were interviewing were their fellow friends of the Best Student Council. It was a case that involved stolen cake. The girl in brown hair spoke, "Rein Tsunomoto had a piece of morning cake, but she was about to enjoy it, after sleeping with her best friend, Sayuri Hida. Rino Rando, secretary of the Best Student Council, is our main suspect. Kaori Izumi was one, but she hardly eats sweets. My logical explanation is that Rino snuck in and ate the cake, except that she also had Pucchan with her."

Pucchan, Rino's puppet friend, shouted, "OKAY! I did it! It was me! I didn't mean to eat your cake, Rein!"

Rino sobbed, "Forgive me, Rein-Senpai… Pucchan was hungry."

Rein shouted, "Rino, it's always about you, yourself, and Rino Rando! You owe me cake, you idiot, dummy, jerk!"

Rino was sobbing, even though Pucchan did it.

Rein then smirked, "HAH! See, Seina! You and Mayura solved the case! I knew that Rino did it, ate it, and munched on it."

Mayura then remarked, "Oh? Then explain, talk, or confess, in your own words, why you have the cream and strawberry inside your uniform!"

Rein gasped, as Seina pointed at her uniform, which had a little white cream on it.

Seina explained the situation:

"You see, Rino couldn't have done it, because she and Pucchan love sweets. But if history learns something, it's that Rein Tsunomoto of the Assault Squad is the #1 queen of sweets. Our FINAL conclusion: Rein did it to herself!"

Mayura said, "In my theory, while sleeping with Sayuri, you couldn't get that delicious cake out of your mind. So… In your unusual way, you must've sleepwalked your way to the cake. From there, you snacked on your cake, while you were in your uniform. Explain that, Rein!"

Rein confessed, "Sorry… But I wanted to be prepared, ready, and early. I didn't want to be late for school, after I tasted my cake. It's just out of a hurried state. Sayuri wanted to do it, too, but she chose not to. Besides, finals are coming up and she, Kaori, Nanaho, and I were to study together… and…"

She bawled, "NO! I'm an idiot! Dummy! Ding-DONG! DOOFUS! When I saw the cake gone, I jumped to the conclusion that it was Rino, Rando, and Rino Rando."

Rino apologized, "Rein… I knew you wouldn't blame me… even though I am simply the one to blame…"

Pucchan said, "You didn't know. Rino isn't a bad kid…"

Rein bowed her head and sobbed, "I'm sorry…"

Rino then stated, "Let's say that I'll pay for your next slice of morning cake."

Nanaho then stated, "Nope. Rein Tsunomoto, what did I say about eating cake at night?"

Rein was being scolded, as Kuon smirked and said to Seina, "Another job well done, Detective."

Seina giggled and saluted, "Thank you, Miss Vice President."

Seina Katsura (formerly Jinguji) (Age 18 – Best Student Council Covert Squad Leader)

Mayura groaned, "All doing our job… but we don't get paid…"

Mayura Ichikawa (Age 17 – Best Student Council Treasurer)

And that's how it started. Seina Katsura and Mayura Ichikawa started a detective agency, which is for free. This idea was made by Seina, as a way that Kaori and Rino did a detective part in one of their duties as Assault Squad members, even though Rino wasn't a member fully; and what they did, concerning over Maachi being busy, after school. Seina had the idea by starting to study the detective novels she started reading. Mayura wanted to help, since she's very observing, after all those years scouting the budget. She suggests that they get paid for their services, and so, Seina agrees.
Kanade Jinguji approves it, but they cannot be paid. The agency was a big hit, but the cake mystery wasn't the first.
There was this one time that they found out what happened to one of the girl's underwear, which was stolen. As it turns out, it was stolen by a live raccoon.
Another time, they solved a case of the missing lunchbox. It turns out that it was left in the bedroom.
And another, which was what happened to the girl's CD. One girl kept it, but never returned it.

Case after case, they solved it… but they were simple cases. Each case they did, it was rather amazing. Mayura declared it as stupid. She was about to call it off, but they are about to experience the biggest case of their young lives…

…A murder case!

Seina Katsura & Mayura Ichikawa
-in-
Murder at Neville Manor

Prologue

It was a dark night. Mayura was resting in her desk, waiting for the results from her budget for this month. She then read a newspaper they got. She read an article:

"Billionaire Steven Neville launches a huge gala dinner event this weekend, inviting the best people in the world. He has invited all the best in the USA and Japan.
Neville is good friends with the Jinguji Conglomerate, since planning to open the Miyagami Community College, coming soon."

Mayura sighed, "How many people does the president know?"

Seina then came in and got two invites to Neville Manor. She said to her, "Would you like to join me at the dinner party, this weekend? I'd love to go."

Mayura snuffed, "I rather not… I want to keep going on the budget."

Seina giggled, "Aw, you're sweet. But you know that everyone else cannot go. Rino, Rein, Ayumu, Minamo, Kaori, Rein, Sayuri, Kotoha, and Maachi are underage, Nanaho had to go visit Brother 4 for a family reunion, Kuon had some business elsewhere, and Kanade said that she felt scared to go on dinner dates with Steven Neville. Cyndi couldn't come, either. All she could say was "No, thank you."."

"I really can't. I'm better off being the treasurer. But, I refuse to do this detective work! It's stupid! Besides, who would want to go as a pathetic treasurer?"

"The invite says bring two; and it is mandatory."

Mayura cried, "I don't want to go!"

Seina smiled, "Sorry… Miss Kanade's orders. It was an okay, except Nanaho disapproved it. But she stepped in and accepted me. She also said that I can invite a friend."

"But you said-."

"She wanted to come, but she can't. She said something about working with Rino. Come on! You can come! Huh, Sleuth Sister?"

Mayura groaned, "Well, at least it's for the best. One: NO detective work, and Two: FREE food!"

Seina smiled, as always, "Sure. We needed a break, now and then…"

They agreed and decided to go to the dinner party.

XXXXX

They arrived at a huge white mansion, with the letter S on it. They appeared in a huge black limo that they rented, which Mayura was crying, all throughout the ride. As they stepped out, they took a view of the mansion.

"What is he, Superman?" Mayura scoffed.

Seina was dressed in a sequin blue dress, while Mayura was in a red-orange evening gown. They arrived at the front door. Seina rang the door bell.

DING-DONG!

"Incidentally, I wonder why he'd invite Miss President to the dinner party." Mayura asked.

Seina replied, "After all they've done, Kanade and Steven were good friends. They sponsored the Miyagami Community College, the Miyagami ER, the Tokyo Tower repainting, the supply of Kanade plush dolls in those vending machines… It's like he's obsessed with her."

Mayura huffed, "If he loved her so much, why not get married?"

"No. He's married to a very hot studly girl. Her name was Heather Dianne. She used to run the Jewelry Shop that was now run by the Jinguji Conglomerate. She was also an alumnus of Kenran Academy."

"Miyagami's rivals? Does she hate Kanade?"

"No."

"I wonder if they'll meet together."

"Not soon. Kanade canceled at the last minute and hired me to replace her."

"She would've told him about it, except it was mandatory."

"I don't get it… A mandatory invite is stupid!"

Mayura then thought, "Yes… Stupid… but also suspicious."

She asked Seina, "So… How long will this take? My legs are hurting."

The door opened. Out came a tall guy with brown hair and a black and red tuxedo.

"You rang, milady?" He spoke in an American accent.

"Uh, hi…" Mayura tittered.

They were both shocked.

"He's huge…" she cringed.

Seina gave him the invite and said, "I am a member of Kanade Jinguji's Best Student Council. Miss Kanade couldn't make it, so I will fill in for her, along with my associate, Miss Mayura Ichikawa. My name is Seina Katsura, and I am a friend of Miss Jinguji."

The man bowed and said, "Come with me…"

He followed the girls inside, as Mayura thought in fear, "I got a bad feeling about this…"

This marks the beginning of a very surprising case.

Seina and Mayura get started… But the case hasn't happened yet…
Find out in the next chapter…