Sweet Necklace ⇔ Precious Jewel

Summary
Part A: It's Valentine's Day and the girls decide to make some chocolates together. When the arrive at school, Tsumiki realizes she forgot the chocolates she wanted to give to Io. Everybody is having fun trading chocolates except Tsumiki. After school, Tsumiki runs back to her house to get the chocolate but on the way back the chocolates got wet. Io arives with his umbrella to protect Tsumiki from the rain. Even though the chocolates are all wet, Io accepts them.

Part B: It's White Day and the boys (including Kyoya) decide to make marshmallows, white chocolate cookies, and gem sweets as return for the chocolates at valentine's day. Sakaki secretly makes pig feet marshmallows as revenge for Mayoi's frogflesh chocolate (Episode 2). At the end Io and Tsumiki talk about the kitty face on Tsumiki's gem sweetbox that Io made just for her.