The Legend of a new class VII

The story starts off with 3 children that had been separated for more than 8 years as they got older, They join a military academy without recognizing eachother. But when a half a year comes they realize who they are, " Is it really you Rean?!" says Alisa with the heart racing through her chest..Then Rean looks at Kato and asks,"It's you kato isn't it...I knew it!!" Kato looks at both of them and smiles,"It really is you guys..."