Well, the link between the two could be in the form of inspiration for fan art or fanfiction. Or maybe there are similarities in the way the stories are structured or the themes explored, but that's all speculation without more specific context.
The connection between Madoka Magica and Jojo Kiss manga could be in terms of style, character design, or perhaps a fan-made mashup. But it's not an official collaboration as far as I know.
Chapter 178, "The Group's Favorite Belongs to No One but Her!", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event.
Chapter 171, "Jiang Yan: There's a ghost!!!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, The afternoon rain stopped and started again, making the air even.... By the end, They weren't any big shots;
Chapter 505, ""Postpartum Care for Sows", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Zhao Lang laughed, but his eyes became considerably clearer, "Is...
Chapter 220, "The program team actually invited such a high-level boss!", is the clearest early answer because Jiang Li finally turns buildup into a real advancement.
Chapter 538, "You Won't Get Angry No Matter What I Ask, Right?", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event.
Chapter 379, "Is This the Way Huaxiu Treats Its Guests?", is the clearest early answer because it turns Liu Suqing's situation into a concrete plot event. The chapter turns that into something concrete by moving from Song Man chuckled twice, evidently displeased, and then positioned...
Chapter 435, "A Skilled Housewife Can't Cook Without Rice", is the clearest early answer because the violence around Dragon Ridge Island becomes final instead of hypothetical. Early on, The elderly dean looked at Zhao Lang with a tinge of regret..
Chapter 421, "Home Robbed", is the clearest early answer because it turns Home Robbed Mu's situation into a concrete plot event. It opens with Mu Ye was originally a fitness trainer. and closes on We've struck gold!" Nina immediately looked at the newcomers with....
Chapter 596, "Then Blow Them All Up", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li shook his head without any expression.
Chapter 208, "Those Who Commit Many Wrongs Will Destroy Themselves", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.