Goto Gakumazawa is the father of Tatsuko.

The second part of Fate/kaleid liner Prisma☆Illya 2wei!. 
 
Illyasviel von Einzbern's life has become ridiculously complicated since the Kaleidostick Ruby convinced her to become a magical girl and join the quest for collecting the seven Class Cards. Since then, almost every day has brought a new surprise, from gaining new friends and partners like Miyu Edelfelt, to encountering her own magical twin! One would think Illya deserves a little time off, right? No such luck: a trip to the beach quickly turns into a magical quest, and Illya finds herself caught in a string of magical feuds, encounters with love potions, an excursion into the world of "boys love" comics (plus the women who read them), and half a dozen other delirious diversions. However, that's only the warm-up for what might be her final mission: recovering the long-lost Eighth Card! 
 
(Source: Sentai Filmworks)

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Just as Miyu was about saved from being swallowed into despair, all of a sudden a mysterious small duo that has mastered the Class Cards suddenly appears in front of the Illya? These witches are taking things to the next level!
 (Source: Comic Walker)

If there's one thing that the long-running Fate/stay night franchise has always been noted for, it's the creative freedom that allows every new installment to develop its own unique take on the overall concept and base set of continuing characters. However, no matter how diverse many of the previous installments have been, you're almost certainly not going to be prepared for the non-stop surreal silliness and fever dream alternative concepts unleashed in this demented new OVA installment. From a surreal talk show where a berserker hostess puts her hapless assassin brother co-host through an increasingly grueling wringer, to spicy ramen endurance tests, magical girls gone wild and wholesale gender-swapping for no apparent reason, you've never seen anything like this! 
 
(Source: Sentai Filmworks)

Short specials included with the Blu-ray Disc/DVD releases.

Gouto Gakumazawa