Doraemon (1979)

The Imprinting Egg (7x26)

:

Nobita gets jealous of Shizuka spending time with Dekisugi and with Doraemon's help, traps Shizuka inside the Imprinting Egg to make her fall in love with him. However, due to Dekisugi falling in Nobita's room just as the Imprinting Egg hatches, Shizuka falls in love with Dekisugi instead. Remade as Shizuka-chan, in an Egg in the 2005 series.