Six character drama tracks and each one captures a completely different slice of life. The _summer Appendix Special Drama CD is a PS2-era bonus disc where each episode focuses on one girl from the visual novel, set around different Japanese seasonal events.
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Chiwa's Valentine kicks things off with that classic awkward holiday energy. The Shimazu family Hinamatsuri episode brings warm family dynamics while Shino's episode (Maiden Heart and Dairy Products) has the kind of absurd premise that only mid-2000s VN bonus content would attempt.
Little Traveller and the Hyper Teru Teru Bouzu episodes lean into summer adventure territory. Wind Chime closes everything out with something quieter, more reflective. These drama CDs are basically fan service in the wholesome sense.
If you played _summer and wanted more time with the cast, this is exactly that.