An enthusiastic reaction, stacking superlatives. 感動的 ('moving, touching') is the な-adjective form of 感動 ('emotional impact'). 美談 ('beautiful tale / uplifting story') is a literary noun for inspirational narratives. 美談の中の美談 ('a beautiful tale among beautiful tales') is a productive emphatic structure: '[category]の中の[category]' = 'the ultimate X / the peak X.' The stacked sentence-final ですs give it a formal but effusive tone.