Gakuto is keeping his class observation day from Hayato by using a stand-in. 
I'm still going with you, then.
In dem Fall komme ich aber doch mit.
En ese caso, yo también iré.
D’accord, mais je viens aussi.
A maggior ragione, allora, vengo con te.
Bom, eu ainda vou com você.
Тогда я точно пойду с тобой.