Tadashi Matsuura (Japanese: 松浦忠史; born March 10, 1976), known exclusively by his stage name Kisaki (きさき), is a Japanese musician, record producer and businessman, whose career in the visual kei scene spans more than 30 years. He is best known for having been the bassist of several bands, including La:Sadie's, Mirage, Syndrome, Kisaki Project, and Phantasmagoria. When Phantasmagoria disbanded in 2007, Kisaki announced his retirement as an active musician. However, in 2010, he ended his retirement and formed the band Lin -The End of Corruption World-.

Kisaki also works as a record producer, including for his two former visual kei record labels, Matina and Under Code Production. These labels launched the careers of many bands, including Vidoll, The Gazette and 12012. In 2023, Matenrou Opera vocalist Sono stated that the visual kei scene would not be what it is today without Kisaki.

As a child in Wakayama Prefecture, Kisaki actively played soccer and went fishing. He first touched an instrument at the end of middle school, when a friend who started to play the drums invited him to play bass. "It wasn't about playing in a band; it was just playing for fun.", "I simply wanted to make loud noise (laughs)." Although he grew fond of music through the Hideaki Tokunaga songs that his mother listened to, he was not thinking about entering the music industry. But that changed when he saw X Japan; "Their look combined both rebelliousness and beauty, and they were great musicians with cool songs". When his parents bought him a bass guitar in his first year of high school, that is when Kisaki started to practice seriously and quickly formed his first band. Inspired by the appearances of X Japan members Yoshiki and Hide, he grew his hair out and began wearing makeup as a visual kei artist. Kisaki would continue to do his own makeup until partway through Phantasmagoria's career.

Kisaki has credited the manager of a local Wakayama live house for his music career. Before his band Levia (formed in 1993), even had their first performance, comments from this manager resulted in them writing their own original material that was distributed as a demo. The band then played at the venue about once a month, and, after being covered on the local news, ended up opening for Pink Sapphire in front of 1,000 people. Kisaki said that this early success caused him to be content and disregard the idea of going to college. However, his bandmates were, and the group disbanded on the day of their high school graduation as Kisaki wanted to expand into Osaka.

Promising his parents that he would find a normal job if he did not have success by the age of 25, Kisaki moved to Osaka alone and joined and left various bands. These included Laybial and Shëy≠dë (pronounced "shade"), which he said did not last long because they were simply a way to get on stage. He remarked that Garden had some success finding an audience, but Stella Maria, which he was invited to join in 1994, had even more. Although he was not the band's leader, he was tasked with promotion and began to take on the role. Kyo, vocalist of a band that Stella Maria played opposite, impressed Kisaki to the point that he desired to form a band with the singer. The bassist explained that he and Kyo went to a lot of concerts in order to carefully scout who they wanted to recruit. The two formed La:Sadie's together in 1996, with Kisaki later describing them as having been "the ideal band". However, despite having what he considered great live performances, Kisaki was told to leave the band after only a year. The four other members of La:Sadie's went on to form Dir En Grey. Kisaki later opined that he had failed to take care of them, "I thought doing lots of good live shows would please the members, but I was wrong. By not giving them time to rest and deciding on recording schedules in between, I must have put a lot of stress and burden on them."

But Kisaki quickly rebounded and began a nationwide tour with his new band Mirage just two months later. They gave out 5,000 copies of the demo "Hyakka Ryoran" for free at their concerts. They had a song used as the ending theme of the television show Break Out. Although Mirage received an offer to sign to Warner Music Japan, Kisaki felt it was too soon and also wanted to follow in the footsteps of Yoshiki by creating his own record label in 1997, Matina. Vocalist Tomo left in summer 1998, and was replaced by Akira. Mirage disbanded in January 2000, but Kisaki already had his next band ready, and Syndrome formed that same month. Guitarist Ken left in 2001 and formed Merry. Syndrome released the mini-album Core in April 2002. However, the band suddenly announced their disbandment, and had their last live on November 18, 2002. Vocalist Asagi and guitarists Sin and Ruiza formed D together, while drummer Shion formed Tinc. With Matina becoming successful, Kisaki explained that the increased workload is what led to all his bands being short-lived, "There was a growing gap between me and the members." The bassist later explained that he was disheartened by his inability to maintain long-lasting bands and questioned his aptitude as a leader, so he decided to start from scratch. He was also hospitalized at this point, but the members of Vidoll expressed a strong desire to work with Kisaki, which led to him forming the label Under Code Production. Vidoll quickly gained popularity, and former members of Matina came to Kisaki and Under Code for guidance with their new bands.

With a desire to still perform, Kisaki formed Kisaki Project (also written as Kisaki Solo Project) with Vidoll vocalist Jui. The band was initially put together to contribute to an omnibus album in 2002, but there were many requests for them to perform so they began irregular activities the following year. The group's lineup often changes, with the bassist himself being the only permanent member. Kisaki writes and composes all of the band's songs, which consist primarily of soft rock and pop ballads. When fronted by Jui, it is credited as Kisaki Project feat. Jui (KISAKI PROJECT feat.樹威). In 2004, they traveled to Europe and released an album there. Also in 2003, Kisaki formed the side project Kisaki & Kansai Kizoku (妃&関西貴族) with Vidoll bassist Rame on vocals.

Around this same time, guitarist Jun approached Kisaki to start a band together, Phantasmagoria. It was announced to be Kisaki's final band, which the bassist said was to show how committed he was to it. Phantasmagoria included CDs in issues of Shoxx magazine and quickly rose to become one of the top three acts on Under Code. They paid close attention to concepts and costumes; Kisaki said the release of the 2006 trilogy – "Kousou Kyoku", "Kyousou Kyoku", and "Gensou Kyoku" – was a turning point for the band. "We spent a lot of time discussing and creating these songs, which had their own color and depth. We paid great attention to the music videos too, as we didn't want to just perform live but also create something that would endure over time. We aimed to make each song stand out, not just as part of an album, but as something people would want to listen to individually." However, Kisaki was arrested that year and convicted for tax evasion. The plans for Under Code Production bands Vidoll, Phantasmagoria, and 12012 to sign to major record labels were scrapped as a result. After receiving a suspended sentence and consulting a lawyer, Kisaki decided to stop performing and focus on running the label. Before disbanding in 2007, Phantasmagoria went on a final tour; "We toured the nation, including the first live music club I played in my hometown, the Wakayama Prefectural Cultural Hall where I first saw Tokunaga Hideaki, and finally at the Osaka International Exchange Center, our base of operations. By having a disbandment live, Phantasmagoria became a legendary phantom band." Kisaki retired from performing to concentrate on managing Under Code Production, he studied management and produced various bands. Although, Phantasmagoria did reunite for special shows in the following few years.