The "Sakura and the X" line of key items may be a reference to the Japanese animated television series
The Sakura of which the texts are referring is the baby chocobo of the chocobo racing circuit renown. This is the same Sakura for which you can obtain trust magic. Additionally, the KI text refers to the chocobo with the line reference, "The hopes of a nation rest on the chocobo's fluffy wings". Sakura means cherry blossom in Japanese and is a very common pet name in Japan.