1K Apaato no Koi

A one-room apartment becomes the setting for a romantic encounter between Natsu and Kouno during a Christmas evening, leading to an emotional aftermath and growing feelings from Kouno. Meanwhile, Naomichi and his childhood friend Kei share the same apartment in the city to save money while Naomichi tries to deepen their relationship. Kouno's unusual behavior and a mysterious letter cause tension between him and Natsu, culminating in a public argument at school. As time passes, Kei completes his second year of university, Natsu and Kouno graduate, and Naomichi leaves another job. After two years, Naomichi and Kei move to a larger apartment, with Kouno and Natsu assisting in the transition.