"It's summer! It's the beach! It's a summer retreat!" The Supernatural Studies Club holds a summer retreat at the club house to find volume two of the notebook containing the legend of the witches, but Yamada's spirits plummet as he is forced to take supplementary lessons and exams with Otsuka Meiko, Tsurukawa Hideaki, and Kameda Mitsuru from the Manga Research Club.
and start to take effect 
gradually after the fact.
und die Effekte setzen erst
später nach und nach ein.
y comenzar a surtir efecto de a poco.
y que comience a surtir efecto poco a poco.
comme c’était le cas
pour le don d’Odagiri.
e potrebbe iniziare a fare effetto
 gradualmente.
e começar a fazer efeito 
gradualmente depois do acontecido.
начнёт действовать
постепенно после применения.