Hitsuji ga Ippiki

Remu, a girl who can manipulate dreams and make them come true, has created a dream room filled with cute things where she happily plays every night. For Remu, who struggles to fit in the real world, dreams are the only place where her heart finds solace. However, one day, a vicious monster appears in her dreams and starts wreaking havoc. Remu summons Arakota, a delinquent Yankee she encounters in the city, in an attempt to make him fight the monster. A dream battle between the girl and the Yankee begins to protect their precious dreams! (Source: Kadokawa, translated)