Aisanai Otoko

Sahara works in publishing with Yagisawa Kei. After vowing he won’t get involved with straight men again after heartbreak, Saraha meets Seto who is a designer at a firm his company collaborates with. Seto begins to pursue Sahara, but what will happen when Sahara learns that Seto isn’t gay?
from Liquid Passion
This is in a series of four, that are sequels or direct spin-offs. The list is as follows:
1. Te wo Tsunaide, Sora wo
2. Amayakana Toge
3. Aisanai Otoko
4. Vanilla Star