Arakawa Under the Bridge Vol. 6 (manga)
Part 6 contains volumes 11 and 12 of the Japanese edition.
The Venus-bound rocket successfully launched against all odds... and now Rec is back after an out-of-this-world encounter with Nino's folks, and even Takai had his own alien encounter that leaves him transformed. As the seasons turn, everyone's eccentricities spiral out and twine together, and the Mayor finds himself expecting...!