“Rosa Gigantea” isn’t her name; it’s her title as a Student Council member. The titles of the other two are Rosa Chinensis and Rosa Foetida. (You don’t need to remember these either.)

Youko: {Visitors from the Vatican are a great privilege. We must wake them feel welcome. And, of course, we need to give them a favorable impression of our school. One of us should give them a tour.}

Sachiko: Onee-san…

{…I think this task should be given to Yumi-chan.}

Yumi: {Rosa Gigantea, you’re choking me…}

Sei: {But Yumi-chan is so squeezable when she makes cute faces!}