S1·E7 The Eggchanting Girl

Tabuki invites Ringo to see one of Yuri's plays with him, followed by dinner, where Yuri invites her and Shoma to a party. At the party, Yuri announces that she and Tabuki are engaged, but Ringo remains determined, dragging Shoma to her school to help her make a love potion, which is foiled by Shoma's penguin. Determined to complete her mission, Ringo sneaks into Tabuki's room one night with the intention of getting impregnated by him.