"Excuse me sir, a mail has arrived." said the mailman."Isamu Takeo, is it?"he added. " Yep. That's me. Thank you!" A boy in his teens said. As he entered his house's door, He read the name of the sender. The name written was " Jenny Crystalia". There, he sat on a table, reading the letter adressed to him. Isamu is a boy in his teens. He is also smart and intelligent.
" Dear Isamu,
Remember me? I'm your childhood friend, Jenny! I heard you're a detective now. Well... I'm an investigator . Mind if I join you in investigating a case? I already solved 5 cases. And I still lack experience. I need your help, Mr. Takeo! No ne