Ruikasa, also known as 類司 in Japanese, is a slash ship between Rui Kamishiro and Tsukasa Tenma from the game Project Sekai.

It should be noted that this is not the same as Kasarui, or 司類, for this is the case where Rui is the dominant one: the “top” as most people would call it.

Trivia

• Their ship is referred to with the "🎈🌟" and "💜💛" emojis.
• Their Kizuna Rank titles include: "Weirdo Combo", "Top☆Star!?", and "The Best Show".
• They have a height difference of 8 cm, Tsukasa being 172 cm and Rui being 180 cm tall.
• They currently have covered 5 songs together (Buriki no Dance, Dappou Rock, KING, Fixer and Nonsense Bungaku), two of which being without an accompanying VIRTUAL SINGER. They also both have solo versions of Rui's second commissioned song, Showtime Ruler.
• Nonsense Bungaku was given to them as a duet (feat. Len) during the Eve tie-in. It is about someone who was lonely but starts trusting again after they meet a certain person, which is reflective of Rui's development with regards to Tsukasa throughout the game's story.
• In the KING 2DMV on Project SEKAI's official YouTube channel, they are shown as playing cards with Tsukasa as the king and Rui as the joker.
• In the Sweet Magic 3DMV, Tsukasa runs over to Rui and gives him a fistbump with a wink and smile.
• The song commissioned for Wonderlands x Showtime's Main Story, Sekai wa Mada Hajimatte sura Inai, mentions a "thick-skinned king" and an "alchemist full of desires", referring to Tsukasa and Rui respectively.
• In Nene's initial 3* second card episode, she tells Emu that Rui and Tsukasa had to stay back at school for detention because Tsukasa almost got blown up in the school's swimming pool.
• Their image and hair colors, yellow and purple, are complimentary colors.
• Their secondary hair colors, orange and blue, are also complimentary.
• In their 2022 birthday card art, Rui wears a white cravat while Tsukasa wears a yellow necktie. In their unit outfits, Tsukasa wears a white cravat while Rui wears a yellow necktie.
• Additionally, the flower Rui is holding in his card is an aster, which means "star," and Tsukasa is associated with the stars.
• Tsukasa and Rui are often respectively associated with the numbers 1 and 2 both in the game and in promotional material.
• Their first Kizuna title is "Henjin 1 2" in Japanese.
• Tsukasa was one of the limited cards for the game's first anniversary event, and Rui was in the second.
• Their art for the summer memory photos was posted for day 12 on the 21st.
• Additionally, Tsukasa's promotional art for the game's second anniversary was posted on day 21, however Rui's was posted on day 13 rather than 12.
• In their unit's cover of Telecaster B-Boy, they are the ones to say the "one, two" lines at the beginning of the song.
• Some fans like to believe that there is a correlation between certain lyrics in 88☆彡 and Donna Ketsumatsu ga Onozomi dai?, which are Tsukasa's second focus song and Rui's third focus song respectively. Tsukasa sings the "I wish happiness will come to that kind of you" line in his song while Rui sings "I know the ending will be a happy one" at the very end of his song. (However, another common theory is that Tsukasa's line is directed towards Saki instead.)
• In Hoshizora no Melody's 3DMV, Rui sings the line "Loneliness melts away with the touch of passion" while he waves to Tsukasa.
• In Rui's 4 star card, "Appreciate That Spirit of Yours" from the On the Stage of Dazzling Light event (Tsukasa's second focus event), the book he holds has stars on it that very closely resemble those in the Nonsense Bungaku 2DMV.
• Rui and Tsukasa's Mastery Rank 5 outfit variants from the On the Stage of Dazzling Light event share the same/similar colours.
• Additionally, their "Sorrow Farewell At the Curtain Call" (Rui's third focus event) outfit variants from Mastery Rank 1 reflect each others default outfits from that event; Tsukasa's MR1 variant shares the same colours as Rui's normal "Hourglass Tuxedo" outfit, and vice versa for Tsukasa's "Advanced Tuxedo" outfit.

https://shipping.fandom.com/wiki/RuiKasa?so=search#Gallery

Links

https://www.pixiv.net/en/tags/司類

https://www.pixiv.net/en/tags/類司

https://www.pixiv.net/en/tags/天馬司

https://www.pixiv.net/en/tags/神代類

Gallery

Alternate Ship Names

Ruitsuka, Tsukarui, Tsui, Tenshiro, Kamiten, KasaRui, Rks, Ritk, Riks