To LOVE-Ru OVA EP4 - Trouble Quest

Rito and the others got stuck inside a RPG game made by Lala's sisters, Nana and Momo. In order to exit from the game, Rito and the others must defeat the great demon lord and rescue Lala. Rito, thinking Lala is behind the entire game, makes progress through the game. He does not realize that the real intent of the game is for Nana and Momo to analyze Rito and find out his true feelings. At the climax of the game, the demon lord teleports Rito to her castle and forces him to admit his feelings to Lala. As Rito cannot bring out a definite answer and Lala covered him up, the angry demon lord tries to defeat all of the characters by modifying the game to give her all the powerups and erase their data. Nana and Momo join in by summoning a giant talking Marron and Celine in her plant form and defeat the demon lord.