Tokyo Tower: Another Story

The story follows Koji, who is curious about Shishi, who has made Toru, who had never had any interest in romance, fall in love with him so much. One day, while working a part-time job, he bumps into Shishi, and although he says it's for his best friend Toru, he calls out to Shishi out of curiosity, and the two end up spending time together.
(Source: Japanese = natalie.mu || Translation = MDL)