So, I've already tagged you with Hanayo here, but I see several other avenues to CR with a few of my other girls:
-Chie is a current member of the Swords of the Savior, so she's probably heard of his father before. Alternatively, maybe his father has mentioned an energetic new recruit that just joined about a year ago that's around Ishimaru's age (she's 18, but close enough, probably)
-Lenna is the last remaining member of the Tycoon noble family, and is probably aware of the Ishimaru name at the very least. She and her family in general is big into charity, and there was probably a quiet offer of help at some point following the scandal.
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-Chie is a current member of the Swords of the Savior, so she's probably heard of his father before. Alternatively, maybe his father has mentioned an energetic new recruit that just joined about a year ago that's around Ishimaru's age (she's 18, but close enough, probably)
-Lenna is the last remaining member of the Tycoon noble family, and is probably aware of the Ishimaru name at the very least. She and her family in general is big into charity, and there was probably a quiet offer of help at some point following the scandal.