Kiseki no Kakera: Higurashi no Naku Koro ni & Umineko no Naku Koro ni Sakushin-shuu

It is a series of Higurashi When They Cry and Umineko When They Cry crossover anthology manga published by Ohzora Publishing.

After moving into the quiet town of Hinamizawa, Maebara Keiichi spends his days blissfully in school often playing games with his local friends. However, appearances can be deceiving. One fateful day, Keiichi stumbles upon news of a murder that had occurred in Hinamizawa. From this point on, horrific events unfold in front of Keiichi, as he soon learns his close friends may not be all that they seem. Based on the amateur mystery game by 7th Expansion, the story is told in a series of different scenarios. Onikakushi is the first in a series of manga following the different scenarios of the Higurashi games. It focuses on Maebara Keiichi's arrival to Hinamizawa.

Each year, the Ushiromiya family gathers at the secluded mansion of its patriarch, the elderly Kinzo. It has been six years since Battler joined his cousins at the annual event, but their happy reunion is overshadowed by worsening weather and an eerie premonition from his youngest cousin—not to mention their parents’ feud over the inheritance. Battler doesn’t hold much stock in dark omens, nor does he believe the tales of the witch rumored to have given his grandfather a fortune in gold…and who walks the halls of the mansion to this day… But when the eighteen family members and servants are trapped on the island by the raging typhoon, the grisly events that follow leave Battler shaken to his core. Is one of his relatives desperate enough to kill for the family fortune? Or is this the work of the Golden Witch? (Source: Yen Press) *Note: Volume 4 also contains the tea party chapter for this episode.*