Despite Honda's obvious discomfort at her having his number, Shizuka thought it best to keep in touch with Otogi; after all, losing friends was never a good thing.
Unfortunately, she didn't actually call Otogi until a couple of months after Battle City. She'd been rather nervous at first - she wasn't sure if he even remembered her - but as they actually began talking again, she grew more relaxed.
Phone calls led to e-mails, and those led to short visits with each other. And as the two of them walked through the city, hand-in-hand, Shizuka wondered why she hadn't called him sooner.