MAGIC KNIGHT RAYEARTH
The Horrible Trap of Summoner Ascot
S1 E8:
Hikaru takes in and cares for a small monster. She names it Hikari. However, Hikari is actually a pet that Ascot was training. When her two friends go in search of her and find the “pet,” Hikaru must explain that she has befriended it. The creature becomes enraged and attacks the girls. Hikaru is forced to kill it. They trio continues on its search to find their Machines.