[Western Crossover] The Best Assistant

On his first day at university, Tim meets a girl. Somehow, despite being Red Robin, he ends up tricked into becoming her assistant!? This girl is actually a detective?! Hey! Why don't you have the last name Holmes? Oh? Then why aren't you called Watson? This is a bomb case. Why are you taking it? Because I like it. Sherlock...? Tim, my Watson, the world's greatest assistant, it's time for us to say goodbye.