Zero no Tsukaima: Koakuma to Harukaze no Concerto

Zero no Tsukaima: Koakuma to Harukaze no Concerto (ゼロの使い魔 小悪魔と春風の協奏曲) is a video game for PS2. It's the first game in the series.

Plot
Saito is summoned to the another world, and gets involved in "love" and "adventure". Becoming a student of Tristanian Academy of Magic, he is subject of Louise's tease and love.

Gameplay
Louise has the "love and "hate" parameters. If you hang around with other girls, her "hate" parameter rises. And if it hits the limit, a horrible event happens to you, so you'll have to keep an eye for it.

Chapters

 * Prologue
 * Chapter 1: Louise the Zero
 * Chapter 2: Black-haired Visitor
 * Chapter 3: Girls Battle
 * Chapter 4: Crisis in Tristain
 * Chapter 5: Genuine Thought

Tabitha's Route
 * Chapter 6: Letter's Secret
 * Chapter 7: Tabitha's Secret
 * Chapter 8: Haruna's Secret
 * Side Story: Night's Secret

Henrietta's Route:
 * Chapter 6: Princess Who Left a Home
 * Chapter 7: Princess's Despair
 * Chapter 8: Princess's Decision
 * Side Story: Charmed Princess

Kirche's Route
 * Chapter 6: Flame Premonition
 * Chapter 7: My Older Brother
 * Chapter 8: Fun of Magic
 * Side Story: Master of a Slight Fever

Haruna's Route:
 * Chapter 6: Unexpected Scout
 * Chapter 7: Haruna's Decision
 * Chapter 8: One More Haruna
 * Side Story: Genuine Feelings

Siesta's Route
 * Chapter 6: Saito's Maid
 * Chapter 7: Iron Man of Cooking
 * Chapter 8: Silent Support
 * Side Story: School Uniform's Appeal

Louise's Route:
 * Chapter 6: Queen's Decision
 * Chapter 7: Noble Spirit
 * Chapter 8: Concerto of a Devil and a Spring Breeze
 * Side Story: Punishment of a Devil