Just watched the final episode.
Meh, what a disappointment. The writers didn't have the courage to let the series finish with its naturally sad conclusion.
All that emotional build-up for Yuuko's disappearance was nullified for the sake of a nonsensical happy end.
Stay together forever, you say? And what happens when Teiichi graduates from middle school, huh? Yeah, let's not think about that...
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Tibi, magnum Innominandum,
signa stellarum nigrarum
et bufaniformis Sadoquae sigilim.
(De Vermis Mysteriis)