Here are some famous romantic books set in Tokyo, Japan:

1. “Norwegian Wood” by Haruki Murakami – This novel is a nostalgic story of loss and burgeoning sexuality, following Toru Watanabe as he recalls his life as a college student in Tokyo in the 1960s and his relationships with two very different women.
2. “After Dark” by Haruki Murakami – Set over the course of one night in Tokyo, this novel intertwines the lives of several characters, including a young woman named Mari and her unexpected encounters that night.
3. “The Devotion of Suspect X” by Keigo Higashino – Though primarily a mystery, this novel also contains elements of romance. It follows the story of a brilliant mathematician who helps his neighbor cover up a crime, motivated by his secret love for her.
4. “Kokoro” by Natsume Sōseki – This classic Japanese novel delves into themes of friendship, love, and loss. While not set entirely in Tokyo, significant portions of the story unfold in the city.
5. “South of the Border, West of the Sun” by Haruki Murakami – This novel explores the themes of love and memory through the life of Hajime, a man who reconnects with his childhood love many years later in Tokyo.
6. “Kitchen” by Banana Yoshimoto – A poignant story of love and loss, this novel revolves around Mikage Sakurai, a young woman who finds solace in cooking and develops a deep bond with Yuichi, a friend who takes her in after her grandmother’s death.
7. “Twinkle Twinkle” by Kaori Ekuni – A contemporary love story about a marriage of convenience between a gay man and a woman who falls in love with him, set against the backdrop of Tokyo.

These novels not only provide romantic narratives but also offer a glimpse into the culture and life in Tokyo.