Koromo wo Tsuki made Tsuretette!

Notes
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"Fly Me to the Moon!" / Nina -
"Watashi wo Tsuki made Tsuuretette!".
A SF manga authored by Takemiya Keiko that started in 1977.
A work inspired (and named after) by the English song, "Fly Me to the Moon", by Bart Howard.
Nina is the main female lead in the story.

-san/-chan -
Japanese honorifics.
-chan is usually used for girls and children in cases where one has more familiarity with the other party than -san.
Koromo likely dislike being called -chan, due to it being similar to treating her like a child.
Saki really did randomly use both towards Koromo.

itadakimashita -
Literally, "I received".
Past tense of "itadakimasu", used to show thanks towards everyone who contributed to food / a meal before eating it.