In order to weigh the balance of faction power, Rinne Tsukimi, a powerful elite in the border headquarters, enjoys a happy daily life of helping each other with Tatokawa, Kazama, Izuku and others. However, he who seems to be powerful also has an unknown past. Even the "him" who is close to him also hides something. However, with the arrangement of large-scale invasion and expedition, he finally discovered the desperate past behind the cheerful mask, and finally the story of mutual healing.
Mission: Growth and Protection
