Kimi dakara Sabishii

Keigo Machieda is a 24-year-old man working in a hotel for tourists in Kyoto. Keigo is afraid of making love, because he fears his own masculinity may hurt his partner. But Keigo has someone he loves: Ayane-san, whom he sees jogging everyday at Nijo Castle. After telling her how he feels, she replies, "I'm a polyamorist, but is that okay with you?" Polyamory is the act of openly having an intimate relationship with multiple people. Keigo wants to have Ayane-san all for himself, and yet... Source: Bungeishunjuu