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Tear Jerker: Mashiro-iro Symphony
Epsiode 9: When Sana sees Shingo and Miu so close together, and she wonders why she's crying.
Episode 10: when Sana realizes she likes Shingo, but can't have him. Airi happens to pass by with an umbrella (it happens to be raining) and shelters Sana while chiding her. Sana finally loses it and cries her heart out while Airi hugs her.
Episode 11: Sana's speech to Airi in the park, about how, even now, she still pines for Shingo.