Mamoru was an only child and had lived with his parents until the day. Sailor Moon and Tuxedo Mask. On his sixth birthday when all three of them had been involved in a car accident, killing the parents. But leaving Mamoru as the sole survivor. However, the incident gave Mamoru retrograde amnesia. Leaving him unable to remember anything about his life prior to the car accident.
He did, however, constantly have dreams about a mysterious girl begging him to find something called the “Silver Crystal”. Believing this Silver Crystal would help him restore his memories. Mamoru would adopt the persona “Tuxedo Mask” and seek out the crystal for himself.
Mamoru first appeared in episode one of the series. After meeting Usagi for the first time, he started calling her “Bunhead,” a nickname he’d call her by every time they met, much to Usagi’s annoyance. It was also starting from episode one that he comes to help Sailor Moon in battle as Tuxedo Mask.
Mamoru’s alter-ego as Tuxedo Mask caught the love of Usagi Tsukino/Sailor Moon after she saw him for the first time. In fact, Tuxedo Mask was one of Usagi’s two main crushes along with Motoki. Although Usagi loved Tuxedo Mask, she didn’t initially like his civilian identity. Mainly because Mamoru always called her by the nickname “Bunhead” that she hated. At the time, she also didn’t know who Tuxedo Mask’s secret identity was. During season one, Mamoru briefly went out with Rei Hino. Though he did not seem as infatuated with her as she was with him.
During season one, Mamoru was also on his own mission to find out who he really was. At night, he would dream about a mysterious woman known as the Moon Princess, telling him that all will be clear when he finds the Silver Crystal; he began searching for it, but coincidently, the Dark Kingdom was also searching for the Silver Crystal. Eventually, he discovered that the Rainbow Crystals would help him find the Silver Crystal, and he began to collect them. However, he preferred to keep the Rainbow Crystals rather than let the Sailor Senshi have them.
Having lost his memories, Mamoru lived his normal life and unlike the Sailor Senshi, it took much longer for him to regain his memories. However, a part of Mamoru still had a heart for Usagi /Sailor Moon and so split from him and became Moonlight Knight, who took Tuxedo Mask’s place.
During the Makaiju arc, Usagi tried to help Mamoru remember who he really was and win his love but was unsuccessful. Worse for Usagi, a new kid named Ann was also competing for Mamoru.
In episode thirteen of the season, the end of the Makai Tree Arc, Moonlight Knight reunited with Mamoru, restoring his memories. Ann, who Mamoru and the Sailor Senshi discovered were actually their enemies in disguise, left Earth along with Ail, leaving Mamoru open for Usagi.
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