When ancient strategist Kongming is transported to modern Japan, he employs military tactics to turn his new friend Eiko into a music star and the music industry becomes a battlefield.

Kashiwagi Kokoro is a university student. He enjoys his campus life and has begun dating Kamijo Sayo. One day, his ex-girlfriend Omori Ringo, who is the one that decided to end their relationship, visits his home and begins to live there. Kashiwagi Kokoro doesn't tell his new girlfriend Kamijo Sayo about Omori Ringo moving in with him.