[2] A spin-off series to Challengers, which follows Tomoe's older brother Souichi, is titled The Tyrant Falls in Love.

Tomoe Tatsumi, a high school student from Nagoya, goes on a trip to Tokyo to take a university entrance exam.

He gets lost wandering around Tokyo when he runs into, Mitsugu Kurokawa, an office worker who had been out drinking with his friend Isogai.

When Tomoe returns to Tokyo to look for a place to live, he asks for Kurokwa's help and Kurokawa offers to let him sub-lessee the extra room in his apartment.

Kurokawa eventually confesses his love to Tomoe and their relationship develops gradually, but not without interference from various friends and relatives.