Metropolitan police investigator, Tsutsumi, is an eccentric who loves solving cases above all others. Imprudent with a wicked tongue, he only needs to find a thin thread of clue to solve cases with his sharp intuition and insight.

Meanwhile, Tsutumi's partner, Sakuma, is a newbie who got assigned to the Metropolitan Police department 6 months ago. But a certain incident caused Sakuma to change. Struck by curiosity, Tsutsumi embraced him when Sakuma changed from his usual demeanor and goes into heat...