Isshou Watashi no Joshu de Ite!

Gokusukeku has always possessed a natural instinct to help others, but after years of being taken advantage of because of his accommodating nature, he decides enough is enough. Determined to change his life, he sets a bold new goal: to finally be the one in charge of every situation. When he transfers to a new high school hoping for a fresh start, fate has other plans. He unexpectedly reunites with three girls who were once his fellow detectives during their elementary school days, instantly pulling him back into a familiar dynamic he was trying to escape. What follows is an intense and heated battle as Gokusukeku fights to claim the lead detective role rather than remaining in the background. He is determined to prove himself as the one calling the shots this time around. However, the true complication lies not in their professional rivalry, but in the unexpected emotions brewing beneath the surface. While Gokusukeku views their reunion through the lens of leadership and competition, the three girls harbor feelings for him that go far beyond solving cases. In this story where the relationship between detective and assistant transforms into something deeply romantic, his quest for authority quickly becomes entangled with matters of the heart.