Marcus is not an individual creator but the name of a Japanese company that was active in the late 1990s, primarily known for producing the恋爱模拟游戏 Sentimental Graffiti (also known as Sentimental Journey). The company, whose representative was Masayoshi Kubota, was responsible for the original concept and planning of the video game that served as the foundation for the anime series. While official production credits for the anime list "Marcus" as the original creator, this attribution refers to the company's role as the originator of the intellectual property rather than a singular person.

The company Marcus was formed to develop multimedia projects, and its most significant contribution to anime is the television series Sentimental Journey, produced by Sunrise and broadcast on TV Tokyo from April to July 1998. The anime is an anthology of twelve standalone episodes, each focusing on a different girl and her bittersweet memories of a first love, a theme adapted from the premise of the original video game. The company's creative identity was thus closely tied to romantic drama and the visual novel genre, which was gaining popularity in the mid-1990s following the success of games like Tokimeki Memorial. Their work aimed to translate interactive storytelling into a linear, epilogue-style narrative format for television.

Beyond the Sentimental Graffiti franchise, Marcus was involved in the production of other animated works, including the OVAs Shoujo Souchou-ai and MVP E.M.U music video, as well as the original concept for the 2003 OVA Seibu Yakyuu Angels. The company also undertook planning and production for the game Sotsugyou III: Wedding Bell. However, the commercial and critical difficulties surrounding the sequel Sentimental Graffiti 2, which featured significant changes to its setting and characters, led to financial struggles. Production delays and poor reception resulted in the company's eventual bankruptcy and dissolution.

The legacy of Marcus is not that of a single artistic visionary but of a production entity that helped facilitate a specific cross-media project of the late 1990s. After the company's collapse, its representative, Masayoshi Kubota, together with his wife, established a new company called Wonderfarm, which inherited the rights to most of Marcus's works. Kubota subsequently continued working in the industry under the pen name Mutsuki Juzo, writing scripts for anime and video games. Notably, the lyrics for the opening theme song of Sentimental Journey were written under this pen name, creating a direct link between the defunct company and the continued creative output of its former principal.