Кохэй Орихара

Kohei, a second-year high school student, lost his parents at a young age and now lives with his aunt. He enjoys teasing the girls, particularly his childhood friend and classmate Mizuka Nagamori, and the transferred student Rumi Nanase. He is a member of the same orchestra club as Mizuka. Due to the heavy loss of his parents and younger sister, Misao Orihara, he is in a state of "Eternity" that disrupts his connection with the outside world, including his personal relationships. As a result, Kohei's life is undesirable - he can disappear in front of the girls and even be completely forgotten the day after close relationships. To avoid disappearing from the world forever, he is looking for someone who will not forget him.