joshikousei mana no nakadashi game

One day, Mana's father suddenly tells her to marry Hitoshi, a sick-room teacher. Mana is happy, but confused.... Hitoshi is confused as well.... "You don't wanna marry me...?" Mana gets mad and makes up her mind to approach Hitoshi. Also, Yurika, a science teacher, also starts approaching Hitoshi.... Well, will Mana be able to win his heart...?